- D The Average Running Times Of Disks Produced By Company A Is 88 1 Minutes And A Standard Deviation Of 6 1 Minutes Wh 1 (22.64 KiB) Viewed 46 times
(d) The average running times of disks produced by Company A is 88.1 minutes and a standard deviation of 6.1 minutes, while Company B obtained a mean running times of 99.3 minutes with a standard deviation of 13.6 minutes. Assume the population are approximately normally distributed. Solve the probability when a random sample of 41 disks from Company B has a mean running times that at most 15 minutes more than the mean running times of a random sample of 32 disks from Company A.