Queslian 1 4 Not yet a nswered Waiting times at a service counter in a pharmacy are exponentially distributed, with expected value 10 minutes' If 100 customers come to the service counter in a day, Marked cm of The expected average waiting time of all customers is Choose... A 1.00 '7 Flag The standard deviation of the average waiting time of 100 customers is Choose... A question The probability that the waiting time of 100 customers is less than 7 minutes i J Choose\