The trade magazine QSR routinely checks the drive-through service times of fast-food restaurants. A 95% confidence interval that results from examining 695 customers in Taco Bell's drive-through has a lower bound of 156.6 seconds and an upper bound of 160.0 seconds. Complete parts (a) through (c). (a) What is the mean service time from the 695 customers? The mean service time from the 695 customers is 158.3 seconds (Type an integer or a decimal. Do not round.) (b) What is the margin of error for the confidence interval? The margin of error is INseconds. (Type an integer or a decimal. Do not round.)