Scores of an IQ test have a bell-shaped distribution with a mean of 100 and a standard deviation of 13. Use the empirical rule (68-95-99.7 rule) to determine the following. (a) What percentage of people has an IQ score between 61 and 139? (b) What percentage of people has an IQ score greater than 113? (a) % (Type an integer or a decimal.) (b) |% (Type an integer or a decimal.)