The trade magazine QSR routinely checks the drive-through service times of fast-food restaurants. A 99% confidence interval that results from examining 641 customers in Taco Bell's drive-through has a lower bound of 158.5 seconds and an upper bound of 162.7 seconds. Complete parts (a) through (c). ..... (a) What is the mean service time from the 641 customers? The mean service time from the 641 customers is 160.6 seconds (Type an integer or a decimal. Do not round.) (b) What is the margin of error for the confidence interval? ulation Me The margin of error is seconds. (Type an integer or a decimal. Do not round.) /1) /1) 4/1) 33/1) 1) next, go to your Re