Data Handling — Practice Quiz
ICSE · Class 7 · Mathematics
Try a 4-question quiz on Data Handling for ICSE Class 7 Mathematics: tap an answer to check it and see why. 90 questions in the full chapter test.
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Quick Quiz: Data Handling
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A class test had a mean score of 160 for 40 observations. One score of 165 was wrongly copied as 125. What is the correct mean?
The mean of 15 observations is 200. One observation is removed, and the mean of the remaining 14 observations becomes 198. What is the removed observation?
The mean of 5 observations x + 3, x + 5, x + 7, x + 9 and x + 11 is 14. What is the value of x?
The mean of 20 observations is 17. Each observation is increased by 8. What is the new mean?
Sample Questions
The mean of 35 observations is 23. If 5 is subtracted from each observation, what is the new mean?
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18
1. Original mean = 23. 2. When each observation is decreased by 5, the mean also decreases by 5. 3. New mean = 23 - 5 = 18. So the new mean is 18.
The mean of 7 observations is 54. If each observation is multiplied by 6, what is the new mean?
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324
1. Original mean = 54. 2. When each observation is multiplied by 6, the mean is also multiplied by 6. 3. New mean = 54 × 6 = 324. So the new mean is 324.
The mean of 15 observations is 54. If each observation is divided by 6, what is the new mean?
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9
1. Original mean = 54. 2. When each observation is divided by 6, the mean is also divided by 6. 3. New mean = 54 ÷ 6 = 9. So the new mean is 9.
The mean of 30 observations is 12. What is the sum of all observations?
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360
1. Sum of all observations = Mean × Number of observations. 2. Sum = 12 × 30 = 360. So the sum of all observations is 360.
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