The operations manager of a plant that manufactures tires wants to compare the actual inner diameters of two grades oftires, each of which is expected to be 575 millimeters. Samples of five tires from each grade wereselected, and the results representing the inner diameters of thetires, ranked from smallest tolargest, are shown below. Complete parts(a) through(c) below.

Grade X Grade Y

568 572

570 574

575 575

579 578

586 582

a. For each of the two grades oftires, compute themean, median, and standard deviation.