b. A caffeine has a half life of about 5 hours. If you drink a cup of coffee (~95 grams of caffeine), how much caffeine
will be left in your body after 15 hours?
Hint: remember, it halves every 5 hours, sot is not equal to
15 (t = 15).

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)?