Is 5.1 a rational number

Question 5 spring semester final exam math evaluate

The weight of full–grown tomatoes at a farm is modeled by a normal distribution with a standard deviation of 18.4 grams. the 95 percent confidence interval for the mean weight of the tomatoes is calculated using a sample of 100 tomatoes. what is the margin of error (half the width of the confidence interval)?

What is the perimeter of a rectangular building that is 80 feet wide and 140 feet deep?