James works as a waiter. he served meals with bills of $23.59, $40.65, & 30.50, and $15.86. if his total for tips was 17.67, what percent tip did he receive for serving these meals?

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)?