Geologist has identified potential independent drilling sights,and have estimated that each has a probability of 60%yielding a profitable oil well.The company wants to identify exactly 4 profitable wells

a)What is the expected number of wells that must be started to identify exactly 4profitable wells

b)If drilling is started on 10sights,what is the probability that fewer than 4profitable wells will be identified

c)What is the probability that the first 4 wells started will identify4 profitable well