The distribution of weights of United States pennies is approximately normal with a mean of 2.5 grams and a standard deviation of 0.03 grams. a. What is the probability that a randomly chosen penny weighs less than 2.4 grams? (please round to four decimal places) b. Describe the sampling distribution of the mean weight of 10 randomly chosen pennies. Mean: grams (please round to one decimal place) Standard Deviation: grams (please round to four decimal places) c. What is the probability that the mean weight of 10 pennies is less than 2.4 grams? (please round to four decimal places)