Based on avalabile information, lead time demand for PC thumb drives averapes 47 unts (narmally dstributed), with a standard deviation of 5 devves. Managoment wants an 85% service level. Refer to the standard mermai table for z-values. a) What valye of Z should be appled? b) How many drives thould be carried as safety sock? units (round your nespanse to the nearest whole number). c) What is the appropriate reorder point? inis (round your response fo the nearest whole numiben)