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The number of arrivals per minute at a bank located in the central business district of a large city was recorded over a period of 200 minutes, with the following results:

Arrivals..............Frequencies.........Probability
0.............................14.......................0.07
1.............................31......................0.155
2.............................47......................0.235
3.............................41......................0.205
4.............................29......................0.145
5.............................21......................0.105
6.............................10......................0.05
7..............................5.......................0.025
8..............................2.......................0.01
Totals.....................200.......................1

A. Compute the expected number of arrivals per minute.
B. Compute the standard deviation.

##### Solution Summary

The solution assists with computing the expected number of arrivals per minute.

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• MSc, Indian Institute of Technology - Roorkee (I.I.T.-ROORKEE)
• BSc, Banaras Hindu University
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