Please help me in explaining the questions below on the topic of statics and probability. (I already know the answers but I need the explanation or work that goes with the questions.

1. Use the following information and the Empirical Rule to estimate the answer. The ages of golfers are normally distributed, with a mean of 38 and a standard deviation of 4. There are 500 golf members at the Mathy Country Club. How many are younger than 34?ANSWER: 80
2. A company manufactures CD players. The quality control department checks 600 CD players and discovers that 12 of them are defective. What is the probability that a CD player is not defective? ANSWER: 0.98
3. A number is selected randomly from a container containing all the integers from 10 to 50. Find the probability the number is greater than 40, given it is even. ANSWER: 5/21