Managers believe that the average time to process a package at the front counter of the Mercuric post office is about three minutes. They want to do a work sampling study to estimate this time more accurately. From a small pilot sample, the standard deviation is estimated to be 0.16 minutes. Management wants to find the sample size needed to achieve a maximum allowable sampling error of \pm 0.030 minutes with a 95 percent confidence 246 157 201 109