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                                                                        Frequency       0 14 1 31 2 47 3 41 4 29 5 21 6 10 7 5 8 2     (a) Compute the expected number of arrivals per minute. (b) Compute the standard deviation.

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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                                                                        Frequency      

0

14

1

31

2

47

3

41

4

29

5

21

6

10

7

5

8

2

 

 

(a) Compute the expected number of arrivals per minute.

(b) Compute the standard deviation.

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