How do you solve and graph inequalities

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.

Me with this one question, and i'll upvote the brainliest answer

You give a $4 tip for a meal that cost $22. approximately what percent of the bill was your tip?