16. Meili baked some pies. She gave 1/5 of them to her sister and 30 of them to her friends. She was left with 2/3 of the pies. She packed these into 15
boxes. Some boxes contained 9 pies while the rest contained 12.

(a) How many pies were packed into the 15 boxes?

(b) How many boxes contained 9 pies?

Thompson and thompson is a steel bolts manufacturing company. their current steel bolts have a mean diameter of 127 millimeters, and a variance of 36. if a random sample of 35 steel bolts is selected, what is the probability that the sample mean would differ from the population mean by greater than 0.5 millimeters? round your answer to four decimal places.