Question

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 purchasing decisions. A sample of 15 cell phone owners is studied. Round the answers to four decimal places.

(a) What is the probability that five or more of them used their phones for guidance on purchasing decisions?

The probability that five or more of them used their phones for guidance on purchasing decisions is BLANK

(b) What is the probability that fewer than eight of them used their phones for guidance on purchasing decisions?

The probability that fewer than eight of them used their phones for guidance on purchasing decisions is BLANK

(c) What is the probability that exactly nine of them used their phones for guidance on purchasing decisions?

The probability that exactly nine of them used their phones for guidance on purchasing decisions is BLANK

(d) Would it be unusual if more than 11 of them used their phones for guidance on purchasing decisions?

It BLANK be unusual if more than 11 of them used their phones for guidance on purchasing decisions since the probability is BLANK

Answer 1