Market researchers are concerned if people who view a commercial remember the product. They often make phone

Question:

Market researchers are concerned if people who view a commercial remember the product. They often make phone surveys two hours after a commercial is shown. Suppose that 20% of the people who watch one commercial remember the product two hours later. Four persons are randomly selected from those who viewed the commercial. Let X denote the number in the sample who remember the product. Obtain the probability of X.
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...