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 14 cell phone owners is studied. Round the answers to at least four decimal places.

Part 1 of 4 (a) What is the probability that seven or more of them used their phones for guidance on purchasing decisions? The probability that seven or more of them used their phones for guidance on purchasing decisions is ____.

Part 2 of 4 (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 ___.

Part 3 of 4 (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 ____

Part 4 of 4 (d) Would it be unusual if more than 10 of them used their phones for guidance on purchasing decisions?

It (Would or Would not) be unusual if more than 10 of them used their phones for guidance on purchasing decisions since the probability is?