Medical: Tumor Recurrence Certain kinds of tumors tend to recur. The following data represent the lengths of time, in months, for a tumor to recur after chemotherapy (Reference: D. P. Byar, Journal of Urology, Vol. 10, pp. 556-561). Note: These data are also available for download at the Online Study Center. 19 18 17 1 21 22 50 1 59 39 43 39 14 45 54 59 46 50 38 40 43 41 10 50 2388 54 46 25 49 5 9 38 18 29 41 24 12 19 36 25 19 39 27 20 Use five classes.