Agirl has 78 coins altogether . 21 of those coins are quarters and the rest are dimes . how many are dimes

Whats the name of the vertical axis

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)?

Can someone me out here number 4 plz