What is the value of S ?

I'll give brainliest if you answer right : )

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.

Which letters from the table represent like terms? a and b b and c a and d b and d