A study conducted by a research group in a recent year reported the 58% of the cell phone owners used their phones inside a single store for guidance on purchasing decisions. A sample of 16 cell phone owner is studied. Round the decimal to four places

a. What is the probability that six or more of them used phones for guidance on purchasing decisions?

b. What is the probability that fewer than ten used their phones on purchasing decisions

c. What is the probability that exactly 9 of used their phones for purchasing decisions

d. Would it be unusual if more than 12 used their phones for guidance for purchasing decisions

It would/would not be unusual if more than 12 used their phones for guidance since the probability is ___