As part of a large ongoing study on the treatment of women with breast cancer. the treatment time [in months} of eight patients whose lymph nodes were cancerfree is recorded. Treatment time is dened as the time from the moment the cancer treatment starts until the patient is declared cancer-free. 9.47 8.60 9.33 16.33 8.50 9.40 167 9.30 What is the mean treatment time for these 8 women