Assume that the average hourly cost of operating a commercial aircraft follows thenormal distribution with a means of $2,100 per hour and a standard deviation of $250.

a) What is the lowest operating cost for 3% of aircraft?

b) What is the probability that it will cost less than $2,500 to operate it?

c) What is the probability that the cost of the operation will be between $2,000 and$2,500?

d) What is the probability that it will cost less than 1700?

I just need the answers and their procedure, thank you.