5. The average cell phone user interacts with their cell phone 60 times per day with a standard deviation of 20. Assuming the number of interactions follows a normal distribution, find: (a) The probability that a randomly selected cell phone user will look at their phone more than 80 times today. (b) The probability that a randomly selected cell phone user will look at their phone between 40 and 80 times today. (c) The percent of cell phone users who look at their phone less than 25 times per day. (d) The minimum number of interactions by cell phone users in the upper 1%