I dont understand how to do this question and there are several questions to this problem. the first being:

Suppose certain coins have weights that are normally distributed with a mean of 5.086 g and a standard deviation of 0.053 g

A vending machine is configured to accept those coins with weights between 4.996 g and 5.176g.

a. If 250 different coins are inserted into the vendingmachine, what is the expected number of rejectedcoins?

I dont want just the answers I need to understand what I am doing

. (Round to the nearestinteger.)