The trade magazine QSR routinely checks the drive-through service times of fast-food restaurants. A 95% confidence interval that results from examining 653 customers in Taco Bell's drive-through has a lower bound of 157.7 seconds and an upper bound of 161.3 seconds. Complete parts (a) through (c). (a) What is the mean service time from the 653 customers? The mean service time from the 653 customers is seconds (Type an integer or a decimal. Do not round.)