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How many calls should the shop expect per hour

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Question: Repair calls. Find the mean and standard deviation of the number of repair calls the appliance shop in Exercise should expect during an 8-hour day.

Exercise: Repairs. The probability model below describes the number of repair calls that an appliance repair shop may receive during an hour.

Repair Calls      0       1         2          3

Probability      0.1     0.3      0.4       0.2

a) How many calls should the shop expect per hour?

b) What is the standard deviation?

Reference no: EM131648312

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