The amount of time that it takes for various slow-growing tumors to double in size are listed in the table on the right. Doubling Time (days) Type of Cancer a. Find the mean and standard deviation of these data. b. How many of these cancers have doubling times that are Rectal cancer Breast cancer 81 93 within 3 standard deviations of the mean? Synovioma Skin cancer 126 c. If a person had a nonspecified tumor that was doubling every 230 days, discuss whether this particular tumor is growing at a rate that would be expected. 132 Lip cancer Testicular cancer 145 153 Esophageal cancer 161 a. The mean of the data is days. (Round to the nearest tenth as needed.)