Sixty percent of all customers at an automotive service station pay for their purchases
with a credit card. If a random sample of ten customers is selected, what is the
probability that at least eight of them pay with a credit card?

Question

Sixty percent of all customers at an automotive service station pay for their purchases
with a credit card. If a random sample of ten customers is selected, what is the
probability that at least eight of them pay with a credit card?

mathmale · Answer

The probability of "success" (i. e., the probability that a given customer pays with a credit card) is .6.  Number of trials:  10.  Every trial is independent of every other.  So:  what kind of probability distribution is relevant?