In cell B12, find the mean for the wait time at a physician's office without a tracking system using the formula =AVERAGE(B2:B11). In cell B13, find the sample standard deviation for the wait time at a physician's office without a tracking system using the formula =STDEV.S(B2:B11). Enter these values below, rounding to three decimal places. A B C 1 Patient Number Without Tracking With Tracking 2 1 23 32 3 2 68 10 4 3 16 13 5 4 21 17 6 5 30 11 7 6 43 38 8 11 10 9 8 24 12 10 9 15 11 11 10 38 14 12 Mean 28.9 13 Standard Deviation 16.6 X 14 Enter a number