Cara's muffin recipe calls for 1 1/2 cups of flour for the muffins and 1/4 cup of flour for the topping. if she makes 1/2 of the original recipe how much flour will she use?

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)?