(1) Certain kinds of tumors tend to recur. The data below represent the lengths of time, in months, for a tumor to recur after chemotherapy. Use five classes. (a) Find the class width. (b) Make a frequency table showing class limits, class boundaries, mid- points, frequencies and relative frequencies. (c) Draw a frequency histogram. 19 18 17 11 21 22 54 46 25 49 50 1 59 39 43 39 5 9 38 18 14 45 54 59 46 50 29 12 19 36 38 40 43 41 10 50 41 25 19 39