The number of families who used the Minneapolis YWCA day care service was recorded over a 30-day period. The results are as follows: 63 58 69 38 66 33 49 60 40 6 20 25 7 49 49 39 42 21 17 4 35 323 53 49 43 19 10 227 222 Click here for the Excel Data File a. Construct a cumulative frequency distribution of this data. (Round your calculated class interval up to the nearest multiple of 5.) Class 15 Less than Cumulative Frequency b. Select a graph of the cumulative frequency polygon of the given data. Graph 1: