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  3. Questions are based on the following data. Each of the 15 customers who arrived at a customer service desk between 9 A.M. and 10

Questions are based on the following data. Each of the 15 customers who arrived at a customer service desk between 9 A.M. and 10

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问题 Questions are based on the following data.
Each of the 15 customers who arrived at a customer service desk between 9 A.M. and 10A.M. was served in order of arrival by one of two customer service representatives. Each representative served one customer at a time and finished with that customer before serving any other customers. The graph shows the waiting and service times, recorded to the nearest minute, for customers numbered 1 to 15.

What was the range of the recorded service times, in minutes, for the 15 customers?
选项 A、4
B、6
C、8
D、9
E、14
答案C
解析 3号、6号和7号客户被服务的时间最长。都为9分钟。15号客户被服务的时间最短，为1分钟。故极差为8，选C。
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