The trade magazine QSR routinely checks the drive through service times of fast food restaurants A 90 confidence interval that results from examining 568 customers in Taco Bell s drive through has a lower bound of 153 8 seconds and an upper bound of 157 4 seconds Complete parts a through o a What is the mean service time from the 568 customers The mean service time from the 568 customers is Type an integer or a decimal Do not round seconds