Mai purchased a prepaid phone card for $25. Long distance calls cost 19 cents a minute using this card. Mai used her card only once to make a long distance call. If the remaining credit on her card is $22.34, how many minutes did her call last?

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.