Question: Internet service providers (ISP) need to resolve customer problems as quickly as possible. The probability for a customer call regarding Internet service interruptionis resolved within

Internet service providers (ISP) need to resolve customer problems as quickly as possible. Theprobabilityfor a customer call regarding Internet service interruptionis resolved within one hour is70%. During one day, the company had10customer calls.(10 marks)

a)What is the probability that exactlyfourof the customers had their problems solved? (Round your answer to thenearest thousandth).

b)What is the mean of the number of calls who had their problems solved?

c)What is the variance of the number of calls who had their problems solved?

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