Question

&9. For a discrete r.v. X , mean is 3.5 and secondfactorial moment is 12.5. Second raw moment isA. 16B. 9C. 10D. -9​

Answer 1

Answer:

In probability theory, the factorial moment is a mathematical quantity defined as the expectation or average of the falling factorial of a random variable. Factorial moments are useful for studying non-negative integer-valued random variables,[1] and arise in the use of probability-generating functions to derive the moments of discrete random variables.

Factorial moments serve as analytic tools in the mathematical field of combinatorics, which is the study of discrete mathematical structures.[2]