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A 911 service center recorded the number of calls received each hour. The number of calls per hour for 1 week can be approximated by following probability distribution.

x

0

1

2

3

4

5

6

7

P(x)

0.01

0.10

0.26

0.33

0.18

0.06

0.03

0.03

Statistics and Probability, Statistics

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