i'm having trouble with math :'(

Assume that the weights of quarters are normally distributed with a mean of 5.67 g and a standard deviation 0.070 g. a vending machine will only accept coins weighing between 5.48 g and 5.82 g. what percentage of legal quarters will be rejected? round your answer to two decimal places.

Combine the information in the problem and the chart using the average balance method to solve the problem.

Another type of subtraction equation is 16-b=7. explain how you would sole this equation then solve it.