Customers arrive at the local grocery store at a steady rate of 40 an hour. Thirty percent of these customers purchase 10 items or less and go to the express line where they enjoy an average checkout time of 5 minutes. Customers that don't meet the express line criterion go to checkout line #2 where they spend an average of 10 minutes checking out. How many people are checking out in line #2 on average?
A) less than or equal to 1.0
B) greater than 1.0 but less than or equal to 3.0
C) greater than 3.0 but less than or equal to 5.0
D) greater than 5.0

Question

Quizplus · Accepted Answer

70% of 40 customers go to line #2, which is 28 customers per hour. With an average checkout time of 10 minutes, the average number of people checking out in line #2 is (28 customers/hour) * (10 minutes/customer) / 60 minutes/hour = 4.67, which falls in the range greater than 3.0 but less than or equal to 5.0.

Customers Arrive at the Local Grocery Store at a Steady