I want to k!Ll myself lol

Ineed asap.i cant understand this question i need someone to me right away

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.

How do businesses a country's economy? a. by investing in goods and services b. by increasing the unemployment rate c. by making profits