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11. Statistics
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Q16 of 37 Page 295

Calculate the coefficient of variation of the following data: 20, 18, 32, 24, 26.

To find

Formula for


= 24



SD =


= 4.89


CV =


= 20.41


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14

The mean and standard deviation of 20 items are found to be 10 and 2 respectively. At the time of checking it was found that an item 12 was wrongly entered as 8. Calculate the correct mean and standard deviation.

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If and , then calculate the coefficient of variation.

17

If the coefficient of variation of a collection of data is 57 and its S.D is 6.84, then find the mean.

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A group of 100 candidates have their average height 163.8 cm with coefficient of variation 3.2. What is the standard deviation of their heights?

Questions · 37
11. Statistics
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