Question: Please help! Also, can you please post excel formulas? Thank you! The number of arrivals per minute at a bank located in the central business

Please help! Also, can you please post excel formulas? Thank you!

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
a. find the expected number of arrivals per minute
b. find the standard deviation.
Arrivals Frequency Probability f(x) x*f(x) x-E[X] (x-E[X])2 (x-E[X])2*f(x)
0 14
1 31
2 47
3 41
4 29
5 21
6 10
7 5
8 2
Total 200 E[X] 0 Variance Var[X]

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