Question

Recently you've noticed that with many products no longer obtainable through purchase at brick and mortar...

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.

Math   Statistics-And-Probability   
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