How can estimating the quotient you check that your answer to a division problem is reasonable

For the equations below which statement is true ?

Which expression shows the sum of the polynomials with like terms grouped together

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.