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A service dedicated to the repair of household appliances receives an average of 15 calls per day. Determine the probability that he receives: a. More

A service dedicated to the repair of household appliances receives an average of 15 calls per day. Determine the probability that he receives:

a. More than 20 calls a day.

b. Less than 13 calls a day

c. Between 11 to 17 calls a day

d. 14 calls a day

( Try Please ,Don't worry about Wrong Solution).

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