{
  "title": "Range and Mean - Grade 7 ICSE",
  "total_questions": 60,
  "questions": [
    {
      "id": 1,
      "difficulty": "easy",
      "question": "Find range: 4, 7, 10, 13, 16 🍎",
      "options": { "A": "12", "B": "13", "C": "16", "D": "4" },
      "correct_answer": "A"
    },
    {
      "id": 2,
      "difficulty": "easy",
      "question": "Mean of 2, 4, 6, 8, 10 🎈",
      "options": { "A": "5", "B": "6", "C": "8", "D": "10" },
      "correct_answer": "B"
    },
    {
      "id": 3,
      "difficulty": "easy",
      "question": "Range = ______ - smallest 🍭",
      "options": { "A": "largest", "B": "mean", "C": "median", "D": "mode" },
      "correct_answer": "A"
    },
    {
      "id": 4,
      "difficulty": "easy",
      "question": "Mean of 5, 10, 15 🎯",
      "options": { "A": "5", "B": "10", "C": "15", "D": "30" },
      "correct_answer": "B"
    },
    {
      "id": 5,
      "difficulty": "easy",
      "question": "Find range: 1, 3, 5, 7, 9 🧸",
      "options": { "A": "8", "B": "9", "C": "10", "D": "5" },
      "correct_answer": "A"
    },
    {
      "id": 6,
      "difficulty": "easy",
      "question": "Mean = sum of observations ÷ ______ 🚀",
      "options": {
        "A": "range",
        "B": "number of observations",
        "C": "largest",
        "D": "smallest"
      },
      "correct_answer": "B"
    },
    {
      "id": 7,
      "difficulty": "easy",
      "question": "Find mean: 10, 20, 30 🧩",
      "options": { "A": "15", "B": "20", "C": "25", "D": "30" },
      "correct_answer": "B"
    },
    {
      "id": 8,
      "difficulty": "easy",
      "question": "Range of: 12, 15, 18, 21, 24 🎨",
      "options": {
        "A": "12",
        "B": "9",
        "C": "24",
        "D": "6"
      },
      "correct_answer": "A"
    },
    {
      "id": 9,
      "difficulty": "easy",
      "question": "Mean of 1, 2, 3, 4, 5 🍦",
      "options": { "A": "2", "B": "3", "C": "4", "D": "5" },
      "correct_answer": "B"
    },
    {
      "id": 10,
      "difficulty": "easy",
      "question": "Find range: 100, 200, 300, 400 🎭",
      "options": { "A": "300", "B": "400", "C": "100", "D": "500" },
      "correct_answer": "A"
    },
    {
      "id": 11,
      "difficulty": "easy",
      "question": "Mean of 6, 7, 8, 9, 10 🦋",
      "options": { "A": "7", "B": "8", "C": "9", "D": "10" },
      "correct_answer": "B"
    },
    {
      "id": 12,
      "difficulty": "easy",
      "question": "Range = largest value - ______ 🏀",
      "options": {
        "A": "mean",
        "B": "smallest value",
        "C": "median",
        "D": "mode"
      },
      "correct_answer": "B"
    },
    {
      "id": 13,
      "difficulty": "easy",
      "question": "Find mean: 0, 5, 10, 15, 20 🍪",
      "options": { "A": "5", "B": "10", "C": "15", "D": "20" },
      "correct_answer": "B"
    },
    {
      "id": 14,
      "difficulty": "easy",
      "question": "Range of: 2.5, 3.0, 3.5, 4.0, 4.5 🧸",
      "options": { "A": "2.0", "B": "2.5", "C": "4.5", "D": "1.5" },
      "correct_answer": "A"
    },
    {
      "id": 15,
      "difficulty": "easy",
      "question": "Mean of first 5 natural numbers 🍩",
      "options": { "A": "2", "B": "3", "C": "4", "D": "5" },
      "correct_answer": "B"
    },
    {
      "id": 16,
      "difficulty": "easy",
      "question": "Find range: 11, 22, 33, 44, 55 🪁",
      "options": { "A": "44", "B": "55", "C": "11", "D": "33" },
      "correct_answer": "A"
    },
    {
      "id": 17,
      "difficulty": "easy",
      "question": "Mean = ______ ÷ number of observations 🐛",
      "options": { "A": "range", "B": "sum", "C": "largest", "D": "smallest" },
      "correct_answer": "B"
    },
    {
      "id": 18,
      "difficulty": "easy",
      "question": "Range of single value 50 is? 🌼",
      "options": { "A": "50", "B": "0", "C": "1", "D": "100" },
      "correct_answer": "B"
    },
    {
      "id": 19,
      "difficulty": "easy",
      "question": "Find mean: 12, 24, 36, 48 🎠",
      "options": { "A": "24", "B": "30", "C": "36", "D": "40" },
      "correct_answer": "B"
    },
    {
      "id": 20,
      "difficulty": "easy",
      "question": "Mean of 4, 8, 12, 16, 20 🥇",
      "options": { "A": "10", "B": "12", "C": "14", "D": "16" },
      "correct_answer": "B"
    },
    {
      "id": 21,
      "difficulty": "medium",
      "question": "Find range: 3.2, 4.5, 5.8, 7.1, 8.4 🦉",
      "options": { "A": "5.2", "B": "8.4", "C": "3.2", "D": "4.5" },
      "correct_answer": "A"
    },
    {
      "id": 22,
      "difficulty": "medium",
      "question": "Mean of 15, 25, 35, 45, 55 🌈",
      "options": { "A": "35", "B": "30", "C": "40", "D": "45" },
      "correct_answer": "A"
    },
    {
      "id": 23,
      "difficulty": "medium",
      "question": "Range indicates ______ of data 🧮",
      "options": {
        "A": "average",
        "B": "spread",
        "C": "middle",
        "D": "frequency"
      },
      "correct_answer": "B"
    },
    {
      "id": 24,
      "difficulty": "medium",
      "question": "Find mean: 100, 150, 200, 250, 300 🚴",
      "options": { "A": "200", "B": "250", "C": "150", "D": "300" },
      "correct_answer": "A"
    },
    {
      "id": 25,
      "difficulty": "medium",
      "question": "Data: 8, 12, 16, 20, 24. Range? 🍉",
      "options": { "A": "16", "B": "8", "C": "24", "D": "12" },
      "correct_answer": "A"
    },
    {
      "id": 26,
      "difficulty": "medium",
      "question": "Mean of first 10 even numbers 🏓",
      "options": { "A": "10", "B": "11", "C": "12", "D": "13" },
      "correct_answer": "B"
    },
    {
      "id": 27,
      "difficulty": "medium",
      "question": "Find range: -5, 0, 5, 10, 15 🎸",
      "options": { "A": "20", "B": "15", "C": "10", "D": "5" },
      "correct_answer": "A"
    },
    {
      "id": 28,
      "difficulty": "medium",
      "question": "Mean = 20, sum = 100. Number of observations? 🧭",
      "options": { "A": "5", "B": "10", "C": "20", "D": "100" },
      "correct_answer": "A"
    },
    {
      "id": 29,
      "difficulty": "medium",
      "question": "Range of: 1/2, 1/4, 3/4, 1 🥨",
      "options": { "A": "1/2", "B": "3/4", "C": "1/4", "D": "1" },
      "correct_answer": "B"
    },
    {
      "id": 30,
      "difficulty": "medium",
      "question": "Find mean: 2.5, 3.5, 4.5, 5.5 🎪",
      "options": { "A": "4.0", "B": "4.5", "C": "5.0", "D": "5.5" },
      "correct_answer": "A"
    },
    {
      "id": 31,
      "difficulty": "medium",
      "question": "Data: a, b, c, d, e. Range = ? 🍕",
      "options": { "A": "e - a", "B": "a - e", "C": "(a+b+c+d+e)/5", "D": "e" },
      "correct_answer": "A"
    },
    {
      "id": 32,
      "difficulty": "medium",
      "question": "Mean of 12 numbers is 6. Their sum? ⚽",
      "options": { "A": "2", "B": "18", "C": "72", "D": "48" },
      "correct_answer": "C"
    },
    {
      "id": 33,
      "difficulty": "medium",
      "question": "Find range: 0.1, 0.3, 0.5, 0.7, 0.9 🍯",
      "options": { "A": "0.8", "B": "0.9", "C": "0.1", "D": "0.5" },
      "correct_answer": "A"
    },
    {
      "id": 34,
      "difficulty": "medium",
      "question": "Mean of 7, 14, 21, 28, 35 🪐",
      "options": { "A": "21", "B": "20", "C": "22", "D": "23" },
      "correct_answer": "A"
    },
    {
      "id": 35,
      "difficulty": "medium",
      "question": "Range of temperature: 18°C to 32°C 🎁",
      "options": { "A": "14°C", "B": "32°C", "C": "18°C", "D": "50°C" },
      "correct_answer": "A"
    },
    {
      "id": 36,
      "difficulty": "medium",
      "question": "Find mean: ₹50, ₹100, ₹150, ₹200, ₹250 🍬",
      "options": { "A": "₹150", "B": "₹100", "C": "₹125", "D": "₹175" },
      "correct_answer": "A"
    },
    {
      "id": 37,
      "difficulty": "medium",
      "question": "If each value +5, range ______ 🎷",
      "options": {
        "A": "increases by 5",
        "B": "decreases by 5",
        "C": "same",
        "D": "doubles"
      },
      "correct_answer": "C"
    },
    {
      "id": 38,
      "difficulty": "medium",
      "question": "Mean of 4 numbers is 25. Sum? 🛸",
      "options": { "A": "100", "B": "25", "C": "50", "D": "75" },
      "correct_answer": "A"
    },
    {
      "id": 39,
      "difficulty": "medium",
      "question": "Range of: 101, 202, 303, 404 🥁",
      "options": { "A": "303", "B": "101", "C": "404", "D": "202" },
      "correct_answer": "A"
    },
    {
      "id": 40,
      "difficulty": "medium",
      "question": "Find mean: 1.1, 2.2, 3.3, 4.4, 5.5 🍍",
      "options": { "A": "3.3", "B": "3.0", "C": "2.2", "D": "4.4" },
      "correct_answer": "A"
    },
    {
      "id": 41,
      "difficulty": "hard",
      "question": "Find range: 2², 3², 4², 5², 6² 🧩🔥",
      "options": { "A": "32", "B": "36", "C": "4", "D": "34" },
      "correct_answer": "A"
    },
    {
      "id": 42,
      "difficulty": "hard",
      "question": "Mean of first 15 natural numbers 🚀🌟",
      "options": { "A": "7.5", "B": "8", "C": "8.5", "D": "9" },
      "correct_answer": "B"
    },
    {
      "id": 43,
      "difficulty": "hard",
      "question": "Data: 5, 10, x, 20, 25. Mean=15. x=? 🏆🎯",
      "options": { "A": "10", "B": "15", "C": "20", "D": "25" },
      "correct_answer": "B"
    },
    {
      "id": 44,
      "difficulty": "hard",
      "question": "Range of: 1/3, 1/2, 2/3, 5/6, 1 🧠💡",
      "options": { "A": "2/3", "B": "1/2", "C": "1/3", "D": "5/6" },
      "correct_answer": "A"
    },
    {
      "id": 45,
      "difficulty": "hard",
      "question": "If each value ×2, mean ______ 🧸📐",
      "options": {
        "A": "doubles",
        "B": "halves",
        "C": "same",
        "D": "can't say"
      },
      "correct_answer": "A"
    },
    {
      "id": 46,
      "difficulty": "hard",
      "question": "Find mean: 0.01, 0.02, 0.03, 0.04, 0.05 🍕🤔",
      "options": { "A": "0.03", "B": "0.02", "C": "0.025", "D": "0.035" },
      "correct_answer": "A"
    },
    {
      "id": 47,
      "difficulty": "hard",
      "question": "Heights: 140cm, 150cm, 160cm, 170cm, 180cm. Range? 🏦📊",
      "options": { "A": "40cm", "B": "50cm", "C": "60cm", "D": "70cm" },
      "correct_answer": "A"
    },
    {
      "id": 48,
      "difficulty": "hard",
      "question": "Mean of a, b, c is 10. Then mean of a+5, b+5, c+5? 🎨🎭",
      "options": { "A": "10", "B": "15", "C": "20", "D": "25" },
      "correct_answer": "B"
    },
    {
      "id": 49,
      "difficulty": "hard",
      "question": "Find range: √4, √9, √16, √25, √36 🍦🔢",
      "options": { "A": "4", "B": "6", "C": "2", "D": "8" },
      "correct_answer": "A"
    },
    {
      "id": 50,
      "difficulty": "hard",
      "question": "Data: 12, 18, 24, 30, 36, 42. Mean? 🪁🧵",
      "options": { "A": "27", "B": "30", "C": "24", "D": "36" },
      "correct_answer": "A"
    },
    {
      "id": 51,
      "difficulty": "hard",
      "question": "If range=20, smallest=15, largest=? 🌌✨",
      "options": { "A": "35", "B": "20", "C": "15", "D": "5" },
      "correct_answer": "A"
    },
    {
      "id": 52,
      "difficulty": "hard",
      "question": "Mean of 5 numbers is 8. If one number 12 removed, new mean? 🚴‍♂️📉",
      "options": { "A": "7", "B": "8", "C": "9", "D": "6" },
      "correct_answer": "A"
    },
    {
      "id": 53,
      "difficulty": "hard",
      "question": "Range of first 10 prime numbers 🍯🎲",
      "options": {
        "A": "27",
        "B": "28",
        "C": "29",
        "D": "30"
      },
      "correct_answer": "A"
    },
    {
      "id": 54,
      "difficulty": "hard",
      "question": "Data: p, q, r, s, t. Mean=m. Mean of p+2, q+2, r+2, s+2, t+2? 🧮🧩",
      "options": { "A": "m", "B": "m+2", "C": "m+5", "D": "2m" },
      "correct_answer": "B"
    },
    {
      "id": 55,
      "difficulty": "hard",
      "question": "Find mean: 1¼, 2½, 3¾, 5 🥨🔑",
      "options": { "A": "3.125", "B": "3.25", "C": "3.375", "D": "3.5" },
      "correct_answer": "A"
    },
    {
      "id": 56,
      "difficulty": "hard",
      "question": "Range of temperatures: -5°C to 25°C 🎸🎶",
      "options": { "A": "20°C", "B": "25°C", "C": "30°C", "D": "-5°C" },
      "correct_answer": "C"
    },
    {
      "id": 57,
      "difficulty": "hard",
      "question": "If each value ÷2, mean ______ 🍉⚖️",
      "options": {
        "A": "doubles",
        "B": "halves",
        "C": "same",
        "D": "four times"
      },
      "correct_answer": "B"
    },
    {
      "id": 58,
      "difficulty": "hard",
      "question": "Data: 2, 4, 6, 8, 10, 12. Mean minus range? 🍍🏁",
      "options": {
        "A": "-3",
        "B": "-1",
        "C": "1",
        "D": "3"
      },
      "correct_answer": "A"
    },
    {
      "id": 59,
      "difficulty": "hard",
      "question": "Find mean of first 20 multiples of 3 🪐🧠",
      "options": { "A": "31.5", "B": "30", "C": "33", "D": "34.5" },
      "correct_answer": "A"
    },
    {
      "id": 60,
      "difficulty": "hard",
      "question": "Range of: 0.001, 0.002, 0.003, 0.004, 0.005 🏀🎭",
      "options": { "A": "0.004", "B": "0.005", "C": "0.001", "D": "0.003" },
      "correct_answer": "A"
    }
  ]
}