A randomized trial was conducted to examine whether surgery can influence the time to recurrence of brain metastasis for patients undergoing treatment for a single brain metastasis. Subjects were randomly assigned to receive surgery or not in addition to standard radiotherapy. The times to recurrence for the two groups are in the table below. Table: Time to recurrence of brain metastasis (weeks) by treatment group. Censored times are marked with (*). Radiotherapy Alone 2*, 2*, 2, 3, 4, 5, 5*, 6, 7, 8, 9, 10, 14, 14*, 18, 19, 20, 22, 22*, 31*, 33, 39, 195* Surgery plus radiotherapy 2*, 2*, 6*, 6*, 6*, 10*, 14*, 21*, 23, 29*, 32*, 34*, 34*, 37, 37*, 42*, 51, 57, 59, 63*, 66*, 71, 71*, 73*, 85* a. Produce (draw) a Kaplan-Meier survival curve for both groups on the same plot. Use the template on the cover pages for this assignment (or create something similar). b. What is the median time to recurrence for each group?