Internet Service Providers (ISP) Need to Resolve Customer Problems as Quickly

Internet service providers (ISP) need to resolve customer problems as quickly as
possible. For one ISP, past data indicate that the likelihood is .80 that customer calls
regarding Internet service interruptions are resolved within one hour. Out of the next 10
customer calls about interrupted service,
A. What is the probability that exactly 7 will be resolved within one hour?
b. What is the probability that at least 7 will be resolved within one hour?
c. How many customers would be expected to have their service problems resolved
within one hour?