What would be the expected value, variance and standard deviation of an event that always took the value one as its outcome?
A)1, 1, 1
B)1, 0, 1
C)1, 0, 0
D)1, 1, 0

Question

Quizplus · Accepted Answer

The expected value (mean) of an event that always takes the value one is 1, since it is the average of all outcomes. The variance measures the spread of the data from the mean; since all outcomes are the same (1), there is no spread, making the variance 0. The standard deviation is the square root of the variance, which is also 0 in this case.

What Would Be the Expected Value, Variance and Standard Deviation