Need Help On This Test Plz

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.

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21 a stick 7 inches long is broken into two pieces, so that one piece is twice as long as the other one. how long are the two pieces?