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Statistics (Class 11 — ~20% weight)

Measures of dispersion — mean deviation, variance, standard deviation, coefficient of variation.

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Q1 · Statistics (Class 11 — ~20% weight) · EASY
The mean deviation about the mean for the data 3, 7, 9, 11, 15 is:
Q2 · Statistics (Class 11 — ~20% weight) · MEDIUM
For a data set with 10 observations, the sum of squares of deviations from mean is 250. What is the standard deviation?
Q3 · Statistics (Class 11 — ~20% weight) · MEDIUM
Two sets of data have the same mean of 50. Set A has a standard deviation of 10 and Set B has a standard deviation of 5. What is the ratio of the coefficient of variation of Set A to that of Set B?
Q4 · Statistics (Class 11 — ~20% weight) · MEDIUM
The mean of 8 numbers is 25. If one number 32 is replaced by 40, the new mean is: