The arrival of customers during randomly chosen 10-min intervals at a drive-in facility specializing in photo development and film sales has been found to follow the probability distribution in Table 6.12. Calculate the expected number of arrivals for 10-min intervals and the standard deviation of the arrivals.
Table 6.12 Arrivals of Customers at a Photo-processing Facility during 10-min Intervals
Number of arrivals (X)
0
1
2
3
4
5
Probability [P(X)]
0.15
0.25
0.20
0.10
0.05
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