The heights of a group of cadet members who participated in a National Day parade are normally distributed with a mean of 165cm and standard deviation of 8cm. a) If a cadet member is randomly selected, find the percentage that he is below 155cm tall.

b) Find the probability that a cadet member selected at random is between 157cm and 177cm.

c) Find the number of cadet members with their heights between 157cm and 177cm, if there are a group of 2000 cadet members.