The probability model below describes the number of repair, Basic Statistics

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The probability model below describes the number of repair

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?

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Basic Statistics: The probability model below describes the number of repair

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