(b) What is the margin of error? State the units (c)Interpret the confidence interval in the context of this problem.The trade magazine QSR routinely checks the drivethrough service times of fast-food restaurants. A 99% confidence interval that results from examining 546 customers in Taco Bell's drivethrough has a lower bound of 162.5 seconds and an upper bound of 165.9 seconds. Complete parts (a) through (c). (E! (a) What is the mean service time from the 546 customers? The mean service time from the 546 customers is D seconds (Type an integer or a decimal. Do not round.)