Chapter 7: The Normal Curve According to the Park-Le Institute for Mental Health Research (PLIMHR), Americans have a mean of 6.8 hours of screen time per day (compared to a mean of 4 hours of screen time per day before the COVID- 19 pandemic (@). If the average amounts of screen time per day follow an approximately normal distribution with a standard deviation of 3.5 hours, answer each of the following: NOTE: For each question, illustrate by noting relevant details on the normal curve and shading the appropriate region. Show the syntax of your calculator inputs. a) What proportion of Americans have a mean of 5 hours of screen time per day or less? Round to 4 decimals.b) What is the probability a random sample of size 15 will have a mean daily amount of screen time 2 hours within the mean? Round to 4 decimals. c) Determine the daily amounts of screen time that separate the middle 86% of the distribution from the area in the tails of the normal distribution. Round answers to 1 decimal