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The probability model below describes the number of repair calls that an appliance repair shop may...

The probability model below describes the number of repair calls that an appliance repair shop may receive during an hour. Complete parts a and b below.

Repair Cells 0 1 2 3

Probability 0.2 0.4 0.2 0.2

Question: How many calls should the shop expect per hour ? ___________ (type an integer or a decimal. Do not round.)

Question: What is the standard deviation ? ________________ (round to two decimals as needed.)

Math   Statistics-And-Probability   
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