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做了一次prep，有道数学不会，求解答~
The number of years of service of the 8 employees in a production department are 15, 10, 9, 17, 6, 4, 14, 16. What is the range in the number of years of service of the 8 employees?
a) 10
b) 11
c) 12
d) 13 --> correct
e) 14
求大神解答！！！！！！！！！！！！！ |
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