Population standard deviation

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

E(X) = μx = (10 + 10 + 8 + 8 + 8 + 10)/6 = 9

V(X) = (10^2 + 10^2 + 8^2 + 8^2 + 8^2 + 10^2 - 6*9^2)/6 = 1

As you're working with an entire population, the formula of E(X) and V(X) work with N.

SD(X) = sqrt(1) = 1

mean is 9.

VAR = [(10-9)^2 + (10-9)^2 + (8-9)^2 + (8-9)^2 + (8-9)^2 + (10-9)^2]/6 = 1
SD = SQRT(VAR) = 1