What should I buy?A study conducted by a research group in a recent year reported that

57% of cell phone owners used their phones inside a store for guidance on purchasingdecisions.A sample of

15 cell phone owners isstudied.Round the answers to at least four decimalplaces.

Part 1 of 4

(a) What is the probability that six or more of them used their phones for guidance on purchasingdecisions?

Part 2 of 4

(b) What is the probability that fewer than ten of them used their phones for guidance on purchasingdecisions?

Part 3 of 4

(c) What is the probability that exactly eight of them used their phones for guidance on purchasingdecisions?

Part 4 of 4

(d) Would it be unusual if more than 10

of them used their phones for guidance on purchasingdecisions? Would or would not?