The following data set refers to the number of customers per day at a store in a mall during a 20-day period. 48 51 53 53 42 81 37 62 10 8 56 46 22 48 29 83 89 26 58 42 a. Identify the first, second, and third quartiles. b. Determine the interquartile range. a. The first quartile is the second quartile is and the third quartile is (Type integers or decimals.) b. The interquartile range is (Type an integer or a decimal.)