In a survey of 634 workers, about 18.6% take longer than 45 minutes to drive to work. Cortney calculates that 62 workers take longer than 45 minutes to drive to work. Is her calculation reasonable?

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.

Solve for x and y: 217x + 131y = 913; 131x + 217y = 827

The birth weights of newborn babies in the unites states follow in a normal distrubution with a mean of 3.4 kg and standard deviation of 0.6 kg. reaserches interested in studying how. children gain weights decide to take random samples of 100 newborn babies and calculate the sample mean birth weights for each sample