{
  "title": "Collection and Presentation of Data - Grade 9 ICSE",
  "total_questions": 60,
  "questions": [
    {"id": 1, "difficulty": "easy", "question": "📊 What do we call the raw facts and figures collected for a study? ", "options": {"A": "Information", "B": "Data", "C": "Conclusion", "D": "Graph"}, "correct_answer": "B"},
    {"id": 2, "difficulty": "easy", "question": "🔢 Which is a method of collecting primary data? ", "options": {"A": "Reading a newspaper", "B": "Conducting a survey", "C": "Watching TV", "D": "Reading a book"}, "correct_answer": "B"},
    {"id": 3, "difficulty": "easy", "question": "📝 What is the first step in any statistical inquiry? ", "options": {"A": "Drawing graphs", "B": "Finding the average", "C": "Collection of data", "D": "Presentation of data"}, "correct_answer": "C"},
    {"id": 4, "difficulty": "easy", "question": "👥 Rohan asked his 5 friends about their favorite sport. What type of data is this? ", "options": {"A": "Secondary data", "B": "Primary data", "C": "Grouped data", "D": "Qualitative data"}, "correct_answer": "B"},
    {"id": 5, "difficulty": "easy", "question": "📚 Data collected from a school record is called? ", "options": {"A": "Primary Data", "B": "First-hand Data", "C": "Original Data", "D": "Secondary Data"}, "correct_answer": "D"},
    {"id": 6, "difficulty": "easy", "question": "📋 A list of marks obtained by students is an example of... ", "options": {"A": "Raw Data", "B": "A Bar Graph", "C": "A Conclusion", "D": "A Pie Chart"}, "correct_answer": "A"},
    {"id": 7, "difficulty": "easy", "question": "❓ What is the purpose of arranging data in a table? ", "options": {"A": "To make it colorful", "B": "To make it longer", "C": "To make it easy to understand", "D": "To hide information"}, "correct_answer": "C"},
    {"id": 8, "difficulty": "easy", "question": "🍎🍌🍇 A teacher notes the fruit each student has: Apple, Banana, Grapes. What kind of data is this? ", "options": {"A": "Numerical Data", "B": "Quantitative Data", "C": "Qualitative Data", "D": "Secondary Data"}, "correct_answer": "C"},
    {"id": 9, "difficulty": "easy", "question": "🔟 Data that tells us 'how many' is called? ", "options": {"A": "Qualitative Data", "B": "Quantitative Data", "C": "Secondary Data", "D": "Primary Data"}, "correct_answer": "B"},
    {"id": 10, "difficulty": "easy", "question": "📈 Which is NOT a way to present data? ", "options": {"A": "Tabular Form", "B": "Graphical Form", "C": "Singing a Song", "D": "Textual Form"}, "correct_answer": "C"},
    {"id": 11, "difficulty": "easy", "question": "📄 Presenting data in paragraph form is called? ", "options": {"A": "Tabular Presentation", "B": "Graphical Presentation", "C": "Textual Presentation", "D": "Pictorial Presentation"}, "correct_answer": "C"},
    {"id": 12, "difficulty": "easy", "question": "📑 What is a frequency table? ", "options": {"A": "A table showing how often something happens", "B": "A table of multiplication", "C": "A timetable for school", "D": "A menu for food"}, "correct_answer": "A"},
    {"id": 13, "difficulty": "easy", "question": "🎯 If you collect data by directly asking people questions, it is... ", "options": {"A": "Primary Data", "B": "Secondary Data", "C": "Grouped Data", "D": "Tertiary Data"}, "correct_answer": "A"},
    {"id": 14, "difficulty": "easy", "question": "💾 Using data from the internet for your project is an example of... ", "options": {"A": "Primary Data Collection", "B": "Direct Observation", "C": "Secondary Data Collection", "D": "Survey"}, "correct_answer": "C"},
    {"id": 15, "difficulty": "easy", "question": "👀 Which method involves watching and recording events? ", "options": {"A": "Interview", "B": "Observation", "C": "Questionnaire", "D": "Reading"}, "correct_answer": "B"},
    {"id": 16, "difficulty": "easy", "question": "📊 What does a tally mark represent? ", "options": {"A": "5 items", "B": "1 item", "C": "10 items", "D": "100 items"}, "correct_answer": "B"},
    {"id": 17, "difficulty": "easy", "question": "📋 How do we represent four tally marks? ", "options": {"A": "||||", "B": "~~||", "C": "卌", "D": "////"}, "correct_answer": "A"},
    {"id": 18, "difficulty": "easy", "question": "📝 A set of questions used to collect data is called a... ", "options": {"A": "Survey", "B": "Questionnaire", "C": "Poll", "D": "Test"}, "correct_answer": "B"},
    {"id": 19, "difficulty": "easy", "question": "✅ Which is a characteristic of good data? ", "options": {"A": "It should be confusing", "B": "It should be unreliable", "C": "It should be relevant", "D": "It should be old"}, "correct_answer": "C"},
    {"id": 20, "difficulty": "easy", "question": "🎓 The marks of 10 students: 45, 50, 55, 60, 65. This is an example of... ", "options": {"A": "Qualitative Data", "B": "Discrete Data", "C": "Continuous Data", "D": "Grouped Data"}, "correct_answer": "B"},
    {"id": 21, "difficulty": "medium", "question": "🧮 The heights of plants (in cm): 12.5, 13.2, 11.8. What type of data is this? ", "options": {"A": "Discrete Quantitative", "B": "Continuous Quantitative", "C": "Qualitative", "D": "Secondary"}, "correct_answer": "B"},
    {"id": 22, "difficulty": "medium", "question": "📋 For the data: Red, Blue, Red, Green, Blue, Red. What is the frequency of 'Red'? ", "options": {"A": "1", "B": "2", "C": "3", "D": "4"}, "correct_answer": "C"},
    {"id": 23, "difficulty": "medium", "question": "📑 In a survey of 20 people, 8 liked Pizza. What is the frequency of people who liked Pizza? ", "options": {"A": "8", "B": "12", "C": "20", "D": "28"}, "correct_answer": "A"},
    {"id": 24, "difficulty": "medium", "question": "📊 You want to know the favorite subject in your class. What is the best method? ", "options": {"A": "Guess randomly", "B": "Ask every student (Census)", "C": "Ask only your friends", "D": "Look on the internet"}, "correct_answer": "B"},
    {"id": 25, "difficulty": "medium", "question": "📈 Data grouped into class intervals like 0-10, 10-20 is called... ", "options": {"A": "Raw Data", "B": "Ungrouped Data", "C": "Grouped Data", "D": "Qualitative Data"}, "correct_answer": "C"},
    {"id": 26, "difficulty": "medium", "question": "🎯 If class interval is 20-30, what is the upper limit? ", "options": {"A": "20", "B": "25", "C": "30", "D": "50"}, "correct_answer": "C"},
    {"id": 27, "difficulty": "medium", "question": "🔢 What is the class mark for the interval 10-20? ", "options": {"A": "10", "B": "15", "C": "20", "D": "30"}, "correct_answer": "B"},
    {"id": 28, "difficulty": "medium", "question": "📝 For grouped data, the difference between upper and lower limits is... ", "options": {"A": "Class Mark", "B": "Class Size", "C": "Frequency", "D": "Range"}, "correct_answer": "B"},
    {"id": 29, "difficulty": "medium", "question": "🧐 The range of data 5, 12, 3, 18, 6 is? ", "options": {"A": "15", "B": "18", "C": "3", "D": "21"}, "correct_answer": "A"},
    {"id": 30, "difficulty": "medium", "question": "📋 Convert to discrete frequency: Marks: 5, 5, 6, 7, 5, 6. Freq of 5? ", "options": {"A": "1", "B": "2", "C": "3", "D": "4"}, "correct_answer": "C"},
    {"id": 31, "difficulty": "medium", "question": "📊 The exclusive class interval 10-20 includes values... ", "options": {"A": "including 10 and 20", "B": "from 10 to 20, including 20", "C": "from 10 to 20, including 10", "D": "from 10 to less than 20"}, "correct_answer": "D"},
    {"id": 32, "difficulty": "medium", "question": "🎓 Tally marks for number 7 are: |||| || . What is the count? ", "options": {"A": "5", "B": "6", "C": "7", "D": "8"}, "correct_answer": "C"},
    {"id": 33, "difficulty": "medium", "question": "🔍 In inclusive class 0-9, 10-19, can 9.5 be placed? ", "options": {"A": "Yes, in 0-9", "B": "Yes, in 10-19", "C": "No, it's not possible", "D": "It needs a new class"}, "correct_answer": "A"},
    {"id": 34, "difficulty": "medium", "question": "📑 Class size for intervals 0-5, 5-10, 10-15 is? ", "options": {"A": "5", "B": "10", "C": "15", "D": "0"}, "correct_answer": "A"},
    {"id": 35, "difficulty": "medium", "question": "🧮 What is the range of this data: 22, 25, 30, 18, 27? ", "options": {"A": "10", "B": "12", "C": "18", "D": "30"}, "correct_answer": "B"},
    {"id": 36, "difficulty": "medium", "question": "📈 If the minimum value is 15 and the maximum is 45, what is the range? ", "options": {"A": "15", "B": "30", "C": "45", "D": "60"}, "correct_answer": "B"},
    {"id": 37, "difficulty": "medium", "question": "🤔 A researcher uses old government data. What is a possible disadvantage? ", "options": {"A": "It is primary", "B": "It might be outdated", "C": "It is always accurate", "D": "It is expensive to get"}, "correct_answer": "B"},
    {"id": 38, "difficulty": "medium", "question": "📝 Which is a source of secondary data for 'car sales in India'? ", "options": {"A": "You visiting car showrooms", "B": "Government transport website", "C": "Your own survey", "D": "Your personal diary"}, "correct_answer": "B"},
    {"id": 39, "difficulty": "medium", "question": "✅ What is the main advantage of primary data? ", "options": {"A": "It is cheaper", "B": "It is readily available", "C": "It is more reliable for your purpose", "D": "It takes less time"}, "correct_answer": "C"},
    {"id": 40, "difficulty": "medium", "question": "📊 The number of students in different classes: I:25, II:30, III:28. How to present this? ", "options": {"A": "Bar Graph", "B": "Histogram", "C": "Frequency Polygon", "D": "All of the above"}, "correct_answer": "A"},
    {"id": 41, "difficulty": "hard", "question": "🎯 For the data: 12, 15, 18, 12, 20, 15, 12, 18, 20, 15, 12, 18, 20, 12, 15. Create a frequency table. What is the frequency of 18? ", "options": {"A": "2", "B": "3", "C": "4", "D": "5"}, "correct_answer": "B"},
    {"id": 42, "difficulty": "hard", "question": "📑 Given inclusive class intervals: 1-10, 11-20, 21-30. What is the class size? ", "options": {"A": "9", "B": "10", "C": "11", "D": "20"}, "correct_answer": "B"},
    {"id": 43, "difficulty": "hard", "question": "🧮 Convert to exclusive classes: 10-19, 20-29, 30-39. What is the first exclusive class? ", "options": {"A": "10-20", "B": "9.5-19.5", "C": "10-19.5", "D": "9.5-20"}, "correct_answer": "B"},
    {"id": 44, "difficulty": "hard", "question": "📊 For grouped data with intervals 0-10 (freq 5), 10-20 (freq 8), what is the total frequency? ", "options": {"A": "10", "B": "13", "C": "18", "D": "30"}, "correct_answer": "B"},
    {"id": 45, "difficulty": "hard", "question": "🔢 If the class mark is 25 and the class size is 10, what is the class interval? ", "options": {"A": "20-30", "B": "15-25", "C": "25-35", "D": "22.5-27.5"}, "correct_answer": "A"},
    {"id": 46, "difficulty": "hard", "question": "📈 In a survey, 40% of 50 people preferred Tea. How many people is that? ", "options": {"A": "10", "B": "20", "C": "30", "D": "40"}, "correct_answer": "B"},
    {"id": 47, "difficulty": "hard", "question": "🎓 The mid-points of classes are 5, 15, 25, 35. What is the class size? ", "options": {"A": "5", "B": "10", "C": "15", "D": "20"}, "correct_answer": "B"},
    {"id": 48, "difficulty": "hard", "question": "📋 Prepare a frequency dist. for: 7, 8, 10, 12, 7, 10, 8, 7, 10, 12, 10, 7, 9. Freq of 10? ", "options": {"A": "2", "B": "3", "C": "4", "D": "5"}, "correct_answer": "C"},
    {"id": 49, "difficulty": "hard", "question": "🧐 For data 21, 24, 27, 30, if we want classes of size 5 starting from 20, what are the classes? ", "options": {"A": "20-25, 25-30", "B": "20-25, 26-30", "C": "20-24, 25-29", "D": "21-25, 26-30"}, "correct_answer": "A"},
    {"id": 50, "difficulty": "hard", "question": "📑 If the lower limit of a class is 12.5 and class size is 5, the upper limit is? ", "options": {"A": "16.5", "B": "17.0", "C": "17.5", "D": "18.0"}, "correct_answer": "C"},
    {"id": 51, "difficulty": "hard", "question": "📊 In a class of 50, 18 students like Math. What is the frequency in percentage? ", "options": {"A": "18%", "B": "36%", "C": "50%", "D": "72%"}, "correct_answer": "B"},
    {"id": 52, "difficulty": "hard", "question": "🔍 For exclusive classes 10-20, 20-30, where does value 20 go? ", "options": {"A": "In the first class", "B": "In the second class", "C": "It is excluded", "D": "It can go in either"}, "correct_answer": "B"},
    {"id": 53, "difficulty": "hard", "question": "🎯 The true limits for the class 30-39 are? ", "options": {"A": "30-39", "B": "29.5-39.5", "C": "30.5-39.5", "D": "29.5-38.5"}, "correct_answer": "B"},
    {"id": 54, "difficulty": "hard", "question": "📝 If the range of data is 48 and the lowest value is 12, what is the highest? ", "options": {"A": "36", "B": "48", "C": "60", "D": "96"}, "correct_answer": "C"},
    {"id": 55, "difficulty": "hard", "question": "🧮 Data: 5.2, 5.8, 6.1, 5.2, 6.5. If class size is 1, starting from 5.0, what is the class for 5.8? ", "options": {"A": "5.0-6.0", "B": "5.5-6.5", "C": "5.0-5.5", "D": "5.5-6.0"}, "correct_answer": "A"},
    {"id": 56, "difficulty": "hard", "question": "📋 What is the cumulative frequency for the class 20-30 if its frequency is 7 and CF of previous class is 15? ", "options": {"A": "7", "B": "15", "C": "22", "D": "30"}, "correct_answer": "C"},
    {"id": 57, "difficulty": "hard", "question": "📈 You have data on heights from 150.5 cm to 180.5 cm. You want 3 equal classes. What is the class size? ", "options": {"A": "5 cm", "B": "10 cm", "C": "15 cm", "D": "30 cm"}, "correct_answer": "B"},
    {"id": 58, "difficulty": "hard", "question": "🎓 In a relative frequency distribution, if total freq is 40 and a class freq is 10, the relative freq is? ", "options": {"A": "0.10", "B": "0.25", "C": "0.40", "D": "4.0"}, "correct_answer": "B"},
    {"id": 59, "difficulty": "hard", "question": "🤔 For the data set 0, 3, 6, 9, 12, if we create classes of size 4 starting from 0, how many classes? ", "options": {"A": "2", "B": "3", "C": "4", "D": "5"}, "correct_answer": "B"},
    {"id": 60, "difficulty": "hard", "question": "✅ A census vs a sample survey. Which is more time-consuming for a large population? ", "options": {"A": "Census", "B": "Sample Survey", "C": "Both are same", "D": "Neither"}, "correct_answer": "A"}
  ]
}