Question

The following are all 6 quiz scores of a student in a statistics course. Each quiz was graded on a 10-point scale. 8,6,9,9, 8, 8 Assuming that these scores constitute an entire population, find the standard deviation of the population. Round your answer to two decimal places.

Answer 1

mean=6+8+8+9+9+10divided 6 =

Answer 2

1.

Explanation:

The mean score is (8+6+9+9+8+8)/ 6

= 48/8

= 8.

Deviations from the mean are 0 , -2, 1, 1, 0, 0

Squares of these deviations are 0, 4, 1, 1, 0, 0

So the variance = (0 + 4 + 1 + 1 + 0 + 0)/ 6 = 1

Standard deviation = √1 = 1.