Understanding Basic Statistics 6th Edition by Charles Henry Brase,Corrinne Pellillo Brase

تمرين 9

Sociology: Ethics The one-time fling! Have you ever purchased an article of clothing (dress, sports jacket, etc.), worn the item once to a party, and then returned the purchase This is called a 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 seven adult friends, what is the probability that
(a) no one has done a one-time fling
(b) at least one person has done a one-time fling
(c) no more than two people have done a one-time fling