The average monthly salary for a newly hired employee at a bank is XXXXXXXXXXIf the hiring salary at this bank is normally distributed with a standard deviation of P2500, find the probability that a...

The average monthly salary for a newly hired employee at a bank is 18000. If the hiring salary at this bank is normally distributed with a standard deviation of P2500, find the probability that a newly hired employee randomly selected from a list received monthly salary

a. Which is less than P 15000
b. Which is between P20000 and P25000
c. Which is more than P25000