The operations manager of a plant that manufactures tires wants to compare the actual inner diameters of two grades of tires, each of which is expected to be 575 millimeters. Samples of ve tires from each grade were selected, and the results representing the inner diameters of the tires, ranked from smallest to largest, are shown below. Complete parts (a) through (c) below. Gradex GradeY D. 563 570 576 580 586 571 574 576 577 579 E> standard deviation of Grade X is much smaller. B. Grade X provides better quality because its mean is much smaller. J" C. Grade Y provides the better quality. While the mean of Grade X is closer to the expected mean, the standard deviation of Grade Y is much smaller. D. Grade Y provides better quality because its mean is much smaller. 0. What would be the effect on your answers in (a) and (b) if the last value for Grade Y were 588 instead of 579? Explain. Choose the correct answer below. When the fth Grade Y tire measures 588 mm rather than 579 mm, Grade Y's mean inner diameter becomes D mm, which is |:| than Grade X's mean inner diameter, and Grade Y's standard deviation changes from D mm to El mm. In this case, Grade X's tires are providing |:I quality in terms of the mean inner diameter. (Round to two decimal places as needed.)