4. Sociology: Ethics. The one-time fling! Have you ever purchased an article of clothing (dress, sports, jackets, etc.) worn the item once to a party, then returned the purchase? This is called the one time fling. About 10% of all adults deliberately do a one-time fling and feel no guilt about it. (Source: "Are you Normal?" By Bernice Kanner St. Martin's Press) In a group of 7 adult friends, what is the probability that:
a) No one has done a one-time fling
b) At least one person has done the one time fling?
c) No more than two people have done a one-time fling?
This is a problem on binomial probability.
p = 10% = 0.1, q = 1 - p = 0.9, n = 7
P(n, r) = nCr ...
Neat ans stp-by-step solution for estimating the probabilities.