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

Arrivals            Frequency
-0                      14
1                       31
2                       47
3                       41
4                       29
5                       21
6                       10
7                        5
8                        2

A) find out the expected number of arrivals per minute.

B) find out the standard deviation.

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