Exhibit 8-2 The Manager of a Grocery Store Has Taken a Random

Multiple Choice

Exhibit 8-2
The manager of a grocery store has taken a random sample of 100 customers. The average length of time it took these 100 customers to check out was 3.0 minutes. It is known that the standard deviation of the checkout time is one minute.
-Refer to Exhibit 8-2. The standard error of the mean equals

A) 0.001
B) 0.010
C) 0.100
D) 1.000