Assume that a set of test scores is normally distributed with a mean of 120 and a standard deviation of 20. Use the 68-95-99.7 rule to find the following quantities. a. The percentage of scores less than 120 is (Round to one decimal place as needed.) b. The percentage of scores greater than 140 is (Round to one decimal place as needed.) c. The percentage of scores between 80 and 140 is (Round to one decimal place as needed.)