The manager of a bank recorded the amount of time
each customer spent waiting in line during peak business
hours one Monday. The frequency distribution below
summarizes the results. Find the mean waiting time.
Round your answer to one decimal place.
A. 59.0 min
B. 9.9 min
C. 8.6 min
D. 9.7 min
Wating time
(minutes)
0-3
4-7
8-11
12-15
16-19
20-23
24-27
Number of
customers
15
12
11
8
8
3
3
