Question

Recently you've noticed that with many products no longer obtainable through purchase at brick and mortar locations, your family is making more purchases on various ecommerce websites.

Define X to be a random variable denoting the total number of packages delivered to your house each day. The probability mass function (pmf) of X is as follows:

x	0	1	2	3	4	5	6
P(X=x)	.18	.20	.22	.19	.13	.06	.02

Compute the expected value of X^2

Compute the expected value of standard deviation of X.

Answer 1