7. According to the National Institute of Humor, the average American reports laughing 2.3 times per day, with a standard deviation of 2.4 times. The distribution of laughing per day is approximately normally distributed. This is a population of people (all Americans). a. What percentage of Americans Jaugh MORE than 2.8 times per day? Remember to write the formula with the proper values as part of your answer. You only need to report the numerical solution here (you will interpret it in part b). Hint: Drawing the curve may help you answer this question. b. Interpret your answer in words c. Out of 950 randomly-sampled Americans, how many individuals would laugh more than 3.4 times per day