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Need Help with statistics case

I have attached the case description.

I do not know how to start solving this case.

4.1. The group would like to further study the process before instituting any changes. If a sample of 50 customers is selected on a given day, what is the probability that

a. fewer than 3 customers would receive a free newspaper?

b. between 2 and 4 customers (inclusive) would receive a free newspaper?

c. more than 5 customers would receive a free newspaper?

4.2. If the process of delivering newspapers could be improved so that only 5% of the customers did not receive delivery by 7 A.M., what would be the probability that in a sample of 50 customers

a. fewer than 3 customers would receive a free newspaper?

b. between 2 and 4 customers (inclusive) would receive a free newspaper?

c. more than 5 customers would receive a free newspaper?

Appreciate any help !!

Thank You.