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Find Average Number of Calls

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The number of phone calls coming into a switchboard in the next five minutes will either be 0, 1, or 2. The probabilities are the same for each of these (1/3). If X is the number of calls arriving in a five-minute time period, what is the mean of X?

a. 1/3
b. 2/3
c. 1
d. 4/3
e. none of the above

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Solution Summary

The solution shows how to find the mean of the given probability distribution to find the average number of calls.

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X could either be 0, 1, or 2. Each of those possibilities has an equal chance ...

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