1
Q:

# If the standard deviation of a population is 6.5, what would be the population variance?

 A) 40.25 B) 42.25 C) 18.25 D) 13

Explanation:
Q:

If the standard deviation of a population is 10, what would be the population variance?

 A) 100 B) 30 C) 5 D) 20

Explanation:

0 77
Q:

The mean of 20 observations is 19. One more observation is included and the new mean becomes 20. The 21st observation is

 A) 20 B) 30 C) 40 D) 42

Explanation:

0 88
Q:

The mean of a distribution is 18 and the standard deviation is 4.5. What is the value of the coefficient of variation?

 A) 50% B) 25% C) 100% D) 75%

Explanation:

0 95
Q:

The mean of the data 2, 9, 9, 3, 6, 9, 4 is

 A) 33/7 B) 6 C) 43/7 D) 7

Explanation:

3 192
Q:

The variance of a set of data is 121. Then the standard deviation of the data is

 A) +-11 B) 11 C) 21 D) 60.5

Explanation:

0 212
Q:

Variance of the data 2, 4, 5, 6, 8, 17 is 23.33. Then the variance of 4, 8, 10, 12, 16, 34 will be

 A) 11.66 B) 46.66 C) 93.3333 D) 4.83

Explanation:

5 496
Q:

The variance of a set of data is 196. Then the standard deviation of the data is

 A) +-14 B) 14 C) 96 D) 98

Explanation:

1 884
Q:

The mean of a distribution is 21 and the standard deviation is 7. What is the value of the coefficient variation?

 A) 16.66% B) 66.66% C) 33.33% D) 100%