What does variance tell us about a random variable Pick the

What does variance tell us about a random variable? Pick the true statement a) It tells us whether the random variable can be positive or negative. b) It tells us how many elements in the sample space have non-zero probability c) It tells us about the deviation from the mean of the random variable. d) It tells us about the mean value of the random variable.

Solution

It tells about deviation from the mean of the random variable option c correct.It is represented as sigma^2