I need to learn this detailed stepsanswers would be greatly

I need to learn this, detailed steps/answers would be greatly appreciated so I understand how you arrived at the answers. Thank you!

A candle maker produces jar candies that have a label weight of 20.4 oz. Assume that the distribution of the weights of these candies is (21.37,0.16). Let X denote the weight of a candle selected at random from the production line. Let X equal the sample mean of the 100 candies selected randomly. Find P(21.31

Solution