What may NOT be said about the mean of a discrete random variable x?
A) It is denoted by.
B) It is the middle value of its probability distribution.
C) It is denoted by E(x), because it is the value of x one can expect to find, on average, by numerous repetitions of the random experiment that generates the variable's actual values.
D) It is correctly described by both (a) and (b).

Question

Quizplus · Accepted Answer

The mean of a discrete random variable x is not necessarily the middle value of its probability distribution. The middle value is the median, not the mean.

What May NOT Be Said About the Mean of a Discrete