When making a statistical inference about the mean of a normally distributed population based on a sample drawn from that population, wich of the following statements is correct, all else being equal?

Aboat costs 19200 and decreases in value by 12% per year. how much will it cost in 5 years

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)?

An elevator travels 310 feet in 10 seconds. at that speed, how far can't his elevator travel in 12 seconds?