Based on available information, lead time demand for PC thumb drives averages 46 units (normally distributed), with a standard deviation of 5 drives. Management wants a 95% service level. Refer to the for z-values. a) What value of Z should be applied? b) How many drives should be carried as safety stock? units (round your response to the nearest whole number). The table below shows the total area under the normal curve for a point that is Z standard deviations to the right of the mean