Problem 1 (2.5 points) The numbers of bread loaves sales in a 30 days are listed below 14 8 6 12 21 4 9 3 24 17 9 5 8 18 16 3 17 19 10 15 5 20 17 14 19 7 10 15 10 8 a. Construct a relative frequency histogram for the data, using 6 class intervals and the value 0 as the lower limit of the 1st class, the value 24 as the upper limit of the 6th class? b. What proportion of the total area under the histogram fall between 12 and 20?