15 Consider the following data: 34 51 19 23 47 45 37 49 25 17 51 30 37 46 39 36 12 47 40 31 26 47 14 41 22 39 15 16 0112.23 (a) Find the number of classes needed to construct a histogram. Number of classes (b) Find the class length. (Round your answer to the nearest whole number.) Class length (d) Tally the number of values in each class and develop a frequency distribution. (Round your midpoint and percent answers to 1 decimal place.) Data Cumulative Lower Upper Midpoint Width Frequency Percent Frequency Percent 12 < 0 0.0