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Probability Distribution and Probability

The Seremonte Emergency Medical Department has recorded the number of emergency
calls received each day for the past 200 days. These data are shown in the this frequency
distribution:

Calls Number of Days
0 22
1 20
2 40
3 558
4 28
5 20
6 5
7 10

a. Determine the probability of distribution based on the frequency distribution
b. What is the mean of the probability distribution?
c. What is the standard deviation of the probability distribution?
d. Compute the coeffiecient for variation
e. Each emergency call requires a team of three individuals to respond, How
many employees must Seremonte have so they can respond to at leas 75% of
the emergency calls?

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