K over 1.5 equals 3 what is k

The lengths of nails produced in a factory are normally distributed with a mean of 4.91 centimeters and a standard deviation of 0.05 centimeters. find the two lengths that separate the top 4% and the bottom 4%. these lengths could serve as limits used to identify which nails should be rejected. round your answer to the nearest hundredth, if necessary.

The function below show how much jayna and hannah charge for babysitting. which statement best compares the two plants?

Having a hard time understanding this question (see attachment).