Let X = the number of living grandparents that a randomly selected adult American has. According to

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Let X = the number of living grandparents that a randomly selected adult American has. According to recent General Social Surveys, its probability distribution is approximately P(0) = 0.71, P(1) = 0.15, P(2) = 0.09, P(3) = 0.03, P(4) = 0.02.
a. Does this refer to a discrete or a continuous random variable? Why?
b. Show that the probabilities satisfy the two conditions for a probability distribution.
c.
Find the mean of this probability distribution.
Distribution
The word "distribution" has several meanings in the financial world, most of them pertaining to the payment of assets from a fund, account, or individual security to an investor or beneficiary. Retirement account distributions are among the most...
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