A6-letter "word" is obtained by spinning a fair spinner (labeled a, b, and c) six times . a. what is the probability of the word containing two of each of the three letters? b. what is the probability of the word containing no b's and at least two a's?

In a survey of 1015 adults, a polling agency asked, "when you retire, do you think you will have enough money to live comfortably or not. of the 1015 surveyed, 534 stated that they were worried about having enough money to live comfortably in retirement. construct a 90% confidence interval for the proportion of adults who are worried about having enough money to live comfortably in retirement.