{
  "title": "Mean, Median and Mode - Grade 7 CBSE",
  "total_questions": 150,
  "questions": [
    {"id": 1, "difficulty": "easy", "question": "What is the mean of 4, 6, 8?", "options": {"A": "6", "B": "7", "C": "5", "D": "4"}, "correct_answer": "A"},
    {"id": 2, "difficulty": "easy", "question": "What is the median of 3, 5, 7?", "options": {"A": "3", "B": "5", "C": "7", "D": "6"}, "correct_answer": "B"},
    {"id": 3, "difficulty": "easy", "question": "Mode of 2, 2, 3, 4 is:", "options": {"A": "3", "B": "4", "C": "2", "D": "2 and 3"}, "correct_answer": "C"},
    {"id": 5, "difficulty": "easy", "question": "Median of 1, 2, 3, 4 is:", "options": {"A": "2.5", "B": "3", "C": "2", "D": "3.5"}, "correct_answer": "A"},
   {"id": 4, "difficulty": "easy", "question": "Mean of 10, 20, 30 is:", "options": {"A": "20", "B": "10", "C": "15", "D": "30"}, "correct_answer": "A"},

    {"id": 6, "difficulty": "easy", "question": "Mode of 5, 6, 6, 8 is:", "options": {"A": "5", "B": "6", "C": "7", "D": "8"}, "correct_answer": "B"},

    {"id": 7, "difficulty": "easy", "question": "Mean of 2, 4, 6, 8:", "options": {"A": "4", "B": "5", "C": "6", "D": "7"}, "correct_answer": "B"},

    {"id": 8, "difficulty": "easy", "question": "Median of 2, 4, 6, 8:", "options": {"A": "4", "B": "5", "C": "6", "D": "7"}, "correct_answer": "B"},

    {"id": 9, "difficulty": "easy", "question": "Mode of 3, 3, 4, 5:", "options": {"A": "3", "B": "4", "C": "5", "D": "No mode"}, "correct_answer": "A"},
       {"id": 10, "difficulty": "easy", "question": "Mean of 12, 14, 16:", "options": {"A": "14", "B": "13", "C": "15", "D": "16"}, "correct_answer": "A"},

    {"id": 11, "difficulty": "easy", "question": "Median of 9, 11, 13:", "options": {"A": "11", "B": "12", "C": "10", "D": "9"}, "correct_answer": "A"},

    {"id": 12, "difficulty": "easy", "question": "Mode of 7, 7, 8, 9:", "options": {"A": "7", "B": "8", "C": "9", "D": "No mode"}, "correct_answer": "A"},
 {"id": 13, "difficulty": "easy", "question": "Mean of 20, 25, 30:", "options": {"A": "25", "B": "20", "C": "30", "D": "22"}, "correct_answer": "A"},
    {"id": 14, "difficulty": "easy", "question": "Median of 10, 12, 14, 16:", "options": {"A": "12", "B": "13", "C": "14", "D": "15"}, "correct_answer": "B"},
    {"id": 15, "difficulty": "easy", "question": "Mode of 11, 12, 12, 13:", "options": {"A": "11", "B": "12", "C": "13", "D": "No mode"}, "correct_answer": "C"},
    {"id": 16, "difficulty": "easy", "question": "Mean of 5, 10, 15, 20:", "options": {"A": "10", "B": "15", "C": "12.5", "D": "20"}, "correct_answer": "C"},

    {"id": 17, "difficulty": "easy", "question": "Median of 4, 6, 8, 10:", "options": {"A": "6", "B": "7", "C": "8", "D": "9"}, "correct_answer": "B"},
 {"id": 18, "difficulty": "easy", "question": "Mode of 1, 2, 2, 3, 4:", "options": {"A": "1", "B": "2", "C": "3", "D": "4"}, "correct_answer": "B"},
     {"id": 19, "difficulty": "easy", "question": "Mean of 50, 60, 70:", "options": {"A": "50", "B": "60", "C": "70", "D": "80"}, "correct_answer": "B"},

    {"id": 20, "difficulty": "easy", "question": "Median of 31, 33, 35, 37:", "options": {"A": "33", "B": "34", "C": "35", "D": "36"}, "correct_answer": "B"},

    {"id": 21, "difficulty": "medium", "question": "Mean of 10, 15, 20, 25:", "options": {"A": "15", "B": "17.5", "C": "20", "D": "22.5"}, "correct_answer": "A"},
    {"id": 22, "difficulty": "medium", "question": "Median of 8, 12, 16, 20, 24:", "options": {"A": "12", "B": "16", "C": "18", "D": "20"}, "correct_answer": "B"},
    {"id": 23, "difficulty": "medium", "question": "Mode of 5, 5, 7, 7, 7, 8:", "options": {"A": "5", "B": "7", "C": "8", "D": "No mode"}, "correct_answer": "C"},
    {"id": 24, "difficulty": "medium", "question": "Mean of first 5 natural numbers:", "options": {"A": "2", "B": "3", "C": "4", "D": "5"}, "correct_answer": "B"},

    {"id": 25, "difficulty": "medium", "question": "Median of first 6 even numbers:", "options": {"A": "6", "B": "7", "C": "8", "D": "9"}, "correct_answer": "B"},
 {"id": 26, "difficulty": "medium", "question": "Mode of 3, 4, 4, 5, 5, 5:", "options": {"A": "4", "B": "5", "C": "6", "D": "4 and 5"}, "correct_answer": "B"},
    {"id": 27, "difficulty": "medium", "question": "Mean of 5 numbers is 25. Sum of four is 70. Fifth number?", "options": {"A": "40", "B": "45", "C": "50", "D": "55"}, "correct_answer": "C"},
     {"id": 28, "difficulty": "medium", "question": "Median of 7, 9, 11, 13, 15:", "options": {"A": "9", "B": "11", "C": "13", "D": "15"}, "correct_answer": "B"},

    {"id": 29, "difficulty": "medium", "question": "Mode of 2, 3, 4, 4, 5, 6:", "options": {"A": "2", "B": "3", "C": "4", "D": "5"}, "correct_answer": "C"},
 {"id": 30, "difficulty": "medium", "question": "Mean of 25, 30, 35, 40:", "options": {"A": "30", "B": "32.5", "C": "33", "D": "35"}, "correct_answer": "B"},
    {"id": 31, "difficulty": "medium", "question": "Median of 14, 18, 22, 26, 30:", "options": {"A": "18", "B": "22", "C": "24", "D": "26"}, "correct_answer": "B"},

    {"id": 32, "difficulty": "medium", "question": "Mode of 10, 10, 11, 11, 11, 12:", "options": {"A": "10", "B": "11", "C": "12", "D": "No mode"}, "correct_answer": "B"},

    {"id": 33, "difficulty": "medium", "question": "Sum of 4 numbers is 100. Mean is:", "options": {"A": "20", "B": "25", "C": "30", "D": "40"}, "correct_answer": "B"},
  {"id": 34, "difficulty": "medium", "question": "Median of 3, 5, 7, 9:", "options": {"A": "5", "B": "6", "C": "7", "D": "8"}, "correct_answer": "B"},
    {"id": 35, "difficulty": "medium", "question": "Mode of 1, 1, 2, 3, 3, 3, 4:", "options": {"A": "1", "B": "2", "C": "3", "D": "4"}, "correct_answer": "C"},
    {"id": 36, "difficulty": "medium", "question": "Mean of 42, 44, 46, 48:", "options": {"A": "44", "B": "45", "C": "46", "D": "47"}, "correct_answer": "B"},

    {"id": 37, "difficulty": "medium", "question": "Median of 17, 21, 25, 29, 33:", "options": {"A": "21", "B": "25", "C": "27", "D": "29"}, "correct_answer": "B"},
 {"id": 38, "difficulty": "medium", "question": "Mode of 15, 16, 17, 17, 18, 18, 18:", "options": {"A": "17", "B": "18", "C": "19", "D": "No mode"}, "correct_answer": "B"},
     {"id": 39, "difficulty": "medium", "question": "Mean of 6 numbers is 30. Sum is:", "options": {"A": "150", "B": "160", "C": "170", "D": "180"}, "correct_answer": "D"},

    {"id": 40, "difficulty": "medium", "question": "Median of 10, 12, 14, 16, 18, 20:", "options": {"A": "14", "B": "15", "C": "16", "D": "17"}, "correct_answer": "B"},

  
    {"id": 41, "difficulty": "hard", "question": "Find mean, median, mode of 12, 14, 16, 18, 20, 22, 24. Largest value is:", "options": {"A": "Mean", "B": "Median", "C": "Mode", "D": "All equal"}, "correct_answer": "A"},
    {"id": 42, "difficulty": "hard", "question": "If 5 is added to each number of a data set, mean:", "options": {"A": "Increases by 5", "B": "Decreases by 5", "C": "Remains same", "D": "Doubles"}, "correct_answer": "A"},
   {"id": 43, "difficulty": "hard", "question": "For data 25, 30, 35, 40, 45, what is range–mean?", "options": {"A": "0", "B": "5", "C": "10", "D": "20"}, "correct_answer": "C"},
     {"id": 44, "difficulty": "hard", "question": "If each number is multiplied by 3, median:", "options": {"A": "Triples", "B": "Doubles", "C": "Same", "D": "Becomes zero"}, "correct_answer": "A"},
  {"id": 45, "difficulty": "hard", "question": "Mean deviation of 10, 20, 30 is:", "options": {"A": "5", "B": "10", "C": "15", "D": "20"}, "correct_answer": "A"},
    {"id": 46, "difficulty": "hard", "question": "If each value increases by 2, mode:", "options": {"A": "Increases by 2", "B": "Decreases by 2", "C": "Same", "D": "Doubles"}, "correct_answer": "A"},
 {"id": 47, "difficulty": "hard", "question": "Mean of squares of 1, 2, 3:", "options": {"A": "4", "B": "5", "C": "6", "D": "7"}, "correct_answer": "C"},
    {"id": 48, "difficulty": "hard", "question": "Removing highest & lowest values decreases:", "options": {"A": "Mean", "B": "Median", "C": "Mode", "D": "None"}, "correct_answer": "A"},
 {"id": 49, "difficulty": "hard", "question": "Mean of first 6 primes:", "options": {"A": "6.83", "B": "7.83", "C": "8.83", "D": "9.83"}, "correct_answer": "A"},
    {"id": 50, "difficulty": "hard", "question": "Median of first 15 natural numbers is:", "options": {"A": "7", "B": "8", "C": "9", "D": "10"}, "correct_answer": "B"},
    {"id": 51, "difficulty": "hard", "question": "If mean of 5 numbers is 18, sum is:", "options": {"A": "80", "B": "85", "C": "90", "D": "95"}, "correct_answer": "C"},
    {"id": 52, "difficulty": "hard", "question": "Mode of distinct data: 2,3,4,5,6:", "options": {"A": "No mode", "B": "3", "C": "4", "D": "6"}, "correct_answer": "A"},
 {"id": 53, "difficulty": "hard", "question": "New mean after subtracting 3 from all values:", "options": {"A": "Decreases by 3", "B": "Increases by 3", "C": "No change", "D": "Doubles"}, "correct_answer": "A"},
    {"id": 54, "difficulty": "hard", "question": "Mean of 10 numbers is 50. Sum is:", "options": {"A": "480", "B": "490", "C": "500", "D": "510"}, "correct_answer": "B"},
    {"id": 55, "difficulty": "hard", "question": "Median of even-numbered data:", "options": {"A": "Middle value", "B": "Average of two middles", "C": "Lowest value", "D": "Highest value"}, "correct_answer": "B"},

    {"id": 56, "difficulty": "hard", "question": "Mean of reciprocals of 1,2,3:", "options": {"A": "0.5", "B": "0.61", "C": "0.66", "D": "0.75"}, "correct_answer": "B"},

    {"id": 57, "difficulty": "hard", "question": "Mode of 1,1,2,2,3,3:", "options": {"A": "1", "B": "2", "C": "3", "D": "No mode"}, "correct_answer": "D"},
  {"id": 58, "difficulty": "hard", "question": "Mean of 6,8,10,12:", "options": {"A": "9", "B": "10", "C": "11", "D": "12"}, "correct_answer": "B"},
    {"id": 59, "difficulty": "hard", "question": "Range of 12,18,24,30:", "options": {"A": "12", "B": "18", "C": "24", "D": "30"}, "correct_answer": "B"},

    {"id": 60, "difficulty": "hard", "question": "Mean deviation of 2,4,6,8:", "options": {"A": "2", "B": "3", "C": "4", "D": "5"}, "correct_answer": "A"}
  ,
 {"id":61,"difficulty":"easy","question":"What is the mean of 6, 8, 10?","options":{"A":"7","B":"8","C":"9","D":"10"},"correct_answer":"B"},
  {"id":62,"difficulty":"easy","question":"Median of 5, 9, 13 is:","options":{"A":"5","B":"9","C":"13","D":"11"},"correct_answer":"B"},
  {"id":63,"difficulty":"easy","question":"Mode of 4, 6, 6, 7 is:","options":{"A":"4","B":"6","C":"7","D":"No mode"},"correct_answer":"B"},
  {"id":64,"difficulty":"easy","question":"Mean of 10, 15, 20 is:","options":{"A":"10","B":"12","C":"15","D":"20"},"correct_answer":"C"},
  {"id":65,"difficulty":"easy","question":"Median of 2, 4, 6, 8 is:","options":{"A":"4","B":"5","C":"6","D":"7"},"correct_answer":"B"},
  {"id":66,"difficulty":"easy","question":"Mode of 9, 9, 10, 11 is:","options":{"A":"9","B":"10","C":"11","D":"No mode"},"correct_answer":"A"},
  {"id":67,"difficulty":"easy","question":"Mean of 3, 6, 9 is:","options":{"A":"5","B":"6","C":"7","D":"8"},"correct_answer":"B"},
  {"id":68,"difficulty":"easy","question":"Median of 11, 13, 15 is:","options":{"A":"11","B":"12","C":"13","D":"14"},"correct_answer":"C"},
  {"id":69,"difficulty":"easy","question":"Mode of 2, 3, 3, 5 is:","options":{"A":"2","B":"3","C":"5","D":"No mode"},"correct_answer":"B"},
  {"id":70,"difficulty":"easy","question":"Mean of 14, 16, 18 is:","options":{"A":"15","B":"16","C":"17","D":"18"},"correct_answer":"B"},
  {"id":71,"difficulty":"easy","question":"Median of 7, 8, 9, 10 is:","options":{"A":"8","B":"8.5","C":"9","D":"9.5"},"correct_answer":"B"},
  {"id":72,"difficulty":"easy","question":"Mode of 1, 1, 2, 4 is:","options":{"A":"1","B":"2","C":"4","D":"No mode"},"correct_answer":"A"},
  {"id":73,"difficulty":"easy","question":"Mean of 20, 30, 40 is:","options":{"A":"25","B":"30","C":"35","D":"40"},"correct_answer":"B"},
  {"id":74,"difficulty":"easy","question":"Median of 6, 10, 14 is:","options":{"A":"6","B":"10","C":"14","D":"12"},"correct_answer":"B"},
  {"id":75,"difficulty":"easy","question":"Mode of 5, 7, 7, 9 is:","options":{"A":"5","B":"7","C":"9","D":"No mode"},"correct_answer":"B"},
  {"id":76,"difficulty":"easy","question":"Mean of 4, 8, 12 is:","options":{"A":"6","B":"7","C":"8","D":"9"},"correct_answer":"C"},
  {"id":77,"difficulty":"easy","question":"Median of 1, 3, 5, 7 is:","options":{"A":"3","B":"4","C":"5","D":"6"},"correct_answer":"B"},
  {"id":78,"difficulty":"easy","question":"Mode of 10, 11, 12 is:","options":{"A":"10","B":"11","C":"12","D":"No mode"},"correct_answer":"D"},
  {"id":79,"difficulty":"easy","question":"Mean of 50, 55, 60 is:","options":{"A":"55","B":"56","C":"57","D":"58"},"correct_answer":"A"},
  {"id":80,"difficulty":"easy","question":"Median of 21, 23, 25 is:","options":{"A":"22","B":"23","C":"24","D":"25"},"correct_answer":"B"},

  {"id":81,"difficulty":"medium","question":"Mean of 12, 18, 24, 30 is:","options":{"A":"18","B":"20","C":"21","D":"22"},"correct_answer":"B"},
  {"id":82,"difficulty":"medium","question":"Median of 5, 10, 15, 20, 25 is:","options":{"A":"10","B":"15","C":"18","D":"20"},"correct_answer":"B"},
  {"id":83,"difficulty":"medium","question":"Mode of 4, 6, 6, 6, 9 is:","options":{"A":"4","B":"6","C":"9","D":"No mode"},"correct_answer":"B"},
  {"id":84,"difficulty":"medium","question":"Mean of first 10 natural numbers is:","options":{"A":"4.5","B":"5","C":"5.5","D":"6"},"correct_answer":"C"},
  {"id":85,"difficulty":"medium","question":"Median of 2, 4, 6, 8, 10, 12 is:","options":{"A":"6","B":"7","C":"8","D":"9"},"correct_answer":"B"},
  {"id":86,"difficulty":"medium","question":"Mode of 7, 8, 8, 9, 9, 9 is:","options":{"A":"8","B":"9","C":"7","D":"No mode"},"correct_answer":"B"},
  {"id":87,"difficulty":"medium","question":"Mean of 8 numbers is 20. Sum is:","options":{"A":"140","B":"150","C":"160","D":"180"},"correct_answer":"C"},
  {"id":88,"difficulty":"medium","question":"Median of 11, 13, 15, 17, 19 is:","options":{"A":"13","B":"14","C":"15","D":"17"},"correct_answer":"C"},
  {"id":89,"difficulty":"medium","question":"Mode of 2, 3, 4, 4, 4, 5 is:","options":{"A":"3","B":"4","C":"5","D":"No mode"},"correct_answer":"B"},
  {"id":90,"difficulty":"medium","question":"Mean of 30, 35, 40, 45 is:","options":{"A":"35","B":"36","C":"37.5","D":"40"},"correct_answer":"C"},

  {"id":91,"difficulty":"medium","question":"Median of 14, 16, 18, 20, 22, 24 is:","options":{"A":"17","B":"18","C":"19","D":"20"},"correct_answer":"C"},
  {"id":92,"difficulty":"medium","question":"Mode of 5, 5, 6, 6, 7, 7 is:","options":{"A":"5","B":"6","C":"7","D":"No mode"},"correct_answer":"D"},
  {"id":93,"difficulty":"medium","question":"Mean of 9 numbers is 15. Sum is:","options":{"A":"120","B":"130","C":"135","D":"140"},"correct_answer":"C"},
  {"id":94,"difficulty":"medium","question":"Median of 3, 7, 11, 15, 19 is:","options":{"A":"7","B":"9","C":"11","D":"13"},"correct_answer":"C"},
  {"id":95,"difficulty":"medium","question":"Mode of 12, 13, 13, 13, 14 is:","options":{"A":"12","B":"13","C":"14","D":"No mode"},"correct_answer":"B"},
  {"id":96,"difficulty":"medium","question":"Mean of 100, 200, 300 is:","options":{"A":"150","B":"200","C":"250","D":"300"},"correct_answer":"B"},
  {"id":97,"difficulty":"medium","question":"Median of 25, 30, 35, 40 is:","options":{"A":"30","B":"32.5","C":"35","D":"37.5"},"correct_answer":"B"},
  {"id":98,"difficulty":"medium","question":"Mode of 6, 7, 8, 9 is:","options":{"A":"6","B":"7","C":"8","D":"No mode"},"correct_answer":"D"},
  {"id":99,"difficulty":"medium","question":"Mean of 4 numbers is 12. Sum is:","options":{"A":"36","B":"42","C":"48","D":"50"},"correct_answer":"C"},
  {"id":100,"difficulty":"medium","question":"Median of 1, 4, 7, 10, 13 is:","options":{"A":"4","B":"7","C":"9","D":"10"},"correct_answer":"B"},

  {"id":101,"difficulty":"medium","question":"Mode of 20, 20, 25, 30 is:","options":{"A":"20","B":"25","C":"30","D":"No mode"},"correct_answer":"A"},
  {"id":102,"difficulty":"medium","question":"Mean of 16, 18, 20, 22 is:","options":{"A":"18","B":"19","C":"20","D":"21"},"correct_answer":"B"},
  {"id":103,"difficulty":"medium","question":"Median of 6, 8, 10, 12, 14, 16 is:","options":{"A":"9","B":"10","C":"11","D":"12"},"correct_answer":"C"},
  {"id":104,"difficulty":"medium","question":"Mode of 3, 5, 5, 6, 7 is:","options":{"A":"3","B":"5","C":"6","D":"7"},"correct_answer":"B"},
  {"id":105,"difficulty":"medium","question":"Mean of 45, 55, 65 is:","options":{"A":"50","B":"55","C":"60","D":"65"},"correct_answer":"B"},
  {"id":106,"difficulty":"medium","question":"Median of 9, 18, 27 is:","options":{"A":"9","B":"18","C":"27","D":"21"},"correct_answer":"B"},
  {"id":107,"difficulty":"medium","question":"Mode of 2, 2, 3, 3, 4 is:","options":{"A":"2","B":"3","C":"2 and 3","D":"No mode"},"correct_answer":"C"},
  {"id":108,"difficulty":"medium","question":"Mean of first 7 even numbers is:","options":{"A":"6","B":"7","C":"8","D":"9"},"correct_answer":"C"},
  {"id":109,"difficulty":"medium","question":"Median of 100, 200, 300, 400 is:","options":{"A":"200","B":"250","C":"300","D":"350"},"correct_answer":"B"},
  {"id":110,"difficulty":"medium","question":"Mode of 9, 10, 11, 12 is:","options":{"A":"9","B":"10","C":"11","D":"No mode"},"correct_answer":"D"},

  {"id":111,"difficulty":"medium","question":"Mean of 6, 12, 18, 24 is:","options":{"A":"12","B":"14","C":"15","D":"18"},"correct_answer":"C"},
  {"id":112,"difficulty":"medium","question":"Median of 13, 15, 17, 19 is:","options":{"A":"15","B":"16","C":"17","D":"18"},"correct_answer":"B"},
  {"id":113,"difficulty":"medium","question":"Mode of 8, 8, 9, 10 is:","options":{"A":"8","B":"9","C":"10","D":"No mode"},"correct_answer":"A"},
  {"id":114,"difficulty":"medium","question":"Mean of 21, 28, 35 is:","options":{"A":"26","B":"28","C":"30","D":"32"},"correct_answer":"B"},
  {"id":115,"difficulty":"medium","question":"Median of 4, 8, 12, 16, 20 is:","options":{"A":"8","B":"10","C":"12","D":"14"},"correct_answer":"C"},
  {"id":116,"difficulty":"medium","question":"Mode of 1, 2, 3, 4 is:","options":{"A":"1","B":"2","C":"3","D":"No mode"},"correct_answer":"D"},
  {"id":117,"difficulty":"medium","question":"Mean of 2, 6, 10, 14 is:","options":{"A":"6","B":"7","C":"8","D":"9"},"correct_answer":"C"},
  {"id":118,"difficulty":"medium","question":"Median of 11, 22, 33, 44, 55 is:","options":{"A":"22","B":"33","C":"44","D":"55"},"correct_answer":"B"},
  {"id":119,"difficulty":"medium","question":"Mode of 3, 3, 3, 6, 6 is:","options":{"A":"3","B":"6","C":"3 and 6","D":"No mode"},"correct_answer":"A"},
  {"id":120,"difficulty":"medium","question":"Mean of 1, 3, 5, 7, 9 is:","options":{"A":"4","B":"5","C":"6","D":"7"},"correct_answer":"B"},

  {"id":121,"difficulty":"medium","question":"Median of 20, 30, 40, 50, 60 is:","options":{"A":"30","B":"40","C":"45","D":"50"},"correct_answer":"B"},
  {"id":122,"difficulty":"medium","question":"Mode of 11, 12, 13, 14 is:","options":{"A":"11","B":"12","C":"13","D":"No mode"},"correct_answer":"D"},
  {"id":123,"difficulty":"medium","question":"Mean of 18, 24, 30 is:","options":{"A":"22","B":"24","C":"26","D":"28"},"correct_answer":"B"},
  {"id":124,"difficulty":"medium","question":"Median of 5, 15, 25, 35 is:","options":{"A":"15","B":"20","C":"25","D":"30"},"correct_answer":"B"},
  {"id":125,"difficulty":"medium","question":"Mode of 2, 4, 4, 6, 8 is:","options":{"A":"2","B":"4","C":"6","D":"8"},"correct_answer":"B"},
  {"id":126,"difficulty":"medium","question":"Mean of 11, 22, 33 is:","options":{"A":"20","B":"22","C":"24","D":"26"},"correct_answer":"B"},
  {"id":127,"difficulty":"medium","question":"Median of 9, 19, 29, 39, 49 is:","options":{"A":"19","B":"29","C":"39","D":"49"},"correct_answer":"B"},
  {"id":128,"difficulty":"medium","question":"Mode of 7, 7, 8, 8, 9 is:","options":{"A":"7","B":"8","C":"7 and 8","D":"No mode"},"correct_answer":"C"},
  {"id":129,"difficulty":"medium","question":"Mean of 4, 9, 14 is:","options":{"A":"8","B":"9","C":"10","D":"11"},"correct_answer":"B"},
  {"id":130,"difficulty":"medium","question":"Median of 1, 2, 3, 4, 5, 6 is:","options":{"A":"3","B":"3.5","C":"4","D":"4.5"},"correct_answer":"B"},

  {"id":131,"difficulty":"hard","question":"Mean of first 20 natural numbers is:","options":{"A":"9.5","B":"10","C":"10.5","D":"11"},"correct_answer":"C"},
  {"id":132,"difficulty":"hard","question":"Median of first 100 natural numbers is:","options":{"A":"49.5","B":"50","C":"50.5","D":"51"},"correct_answer":"C"},
  {"id":133,"difficulty":"hard","question":"Mode of 2, 2, 3, 3, 4, 4 is:","options":{"A":"2","B":"3","C":"4","D":"No mode"},"correct_answer":"D"},
  {"id":134,"difficulty":"hard","question":"Mean of 5 consecutive even numbers is 20. Largest number is:","options":{"A":"22","B":"24","C":"26","D":"28"},"correct_answer":"B"},
  {"id":135,"difficulty":"hard","question":"If each observation is doubled, mean becomes:","options":{"A":"Half","B":"Same","C":"Double","D":"Triple"},"correct_answer":"C"},
  {"id":136,"difficulty":"hard","question":"Mean of squares of 2, 4 is:","options":{"A":"8","B":"10","C":"12","D":"16"},"correct_answer":"B"},
  {"id":137,"difficulty":"hard","question":"Median of 3, 6, 9, 12, 15, 18 is:","options":{"A":"9","B":"10.5","C":"12","D":"13.5"},"correct_answer":"B"},
  {"id":138,"difficulty":"hard","question":"If 10 is added to each value, median:","options":{"A":"Decreases","B":"Same","C":"Increases by 10","D":"Doubles"},"correct_answer":"C"},
  {"id":139,"difficulty":"hard","question":"Mode of 5, 10, 15, 20 is:","options":{"A":"5","B":"10","C":"15","D":"No mode"},"correct_answer":"D"},
  {"id":140,"difficulty":"hard","question":"Mean of 1st 9 multiples of 3 is:","options":{"A":"12","B":"13","C":"15","D":"18"},"correct_answer":"C"},
  {"id":141,"difficulty":"hard","question":"Median of data having odd observations is:","options":{"A":"Average","B":"Middle value","C":"Highest value","D":"Lowest value"},"correct_answer":"B"},
  {"id":142,"difficulty":"hard","question":"Mean of 2, 4, 8, 16 is:","options":{"A":"6","B":"7.5","C":"8","D":"10"},"correct_answer":"B"},
  {"id":143,"difficulty":"hard","question":"If all values decrease by 5, mean:","options":{"A":"Increases","B":"Same","C":"Decreases by 5","D":"Becomes zero"},"correct_answer":"C"},
  {"id":144,"difficulty":"hard","question":"Median of 11, 22, 33, 44, 55, 66 is:","options":{"A":"33","B":"38.5","C":"44","D":"48.5"},"correct_answer":"B"},
  {"id":145,"difficulty":"hard","question":"Mode of 1, 2, 2, 3, 3, 4 is:","options":{"A":"2","B":"3","C":"2 and 3","D":"No mode"},"correct_answer":"C"},
  {"id":146,"difficulty":"hard","question":"Mean of 6 numbers is 18. Sum is:","options":{"A":"96","B":"102","C":"108","D":"120"},"correct_answer":"C"},
  {"id":147,"difficulty":"hard","question":"Median of first 11 odd numbers is:","options":{"A":"9","B":"11","C":"13","D":"15"},"correct_answer":"B"},
  {"id":148,"difficulty":"hard","question":"Mode of 4, 6, 8, 10 is:","options":{"A":"4","B":"6","C":"8","D":"No mode"},"correct_answer":"D"},
  {"id":149,"difficulty":"hard","question":"Mean of 20, 40, 60, 80 is:","options":{"A":"40","B":"45","C":"50","D":"60"},"correct_answer":"C"},
  {"id":150,"difficulty":"hard","question":"Median of 2, 6, 10, 14, 18 is:","options":{"A":"6","B":"10","C":"12","D":"14"},"correct_answer":"B"}
]
}