An assembly-line machine turns out washers with the following thicknesses (in millimeters). Find the mean and standard deviation of the thicknesses. 1.51 1.78 1.92 2.05 1.84 1.35 1.88 1.63 1.83 1.76 1.27 1.24 2.07 1.98 1.24 1.52 The mean is 1.6794 mm. (Round to four decimal places as needed.) The standard deviation is mm. (Use the answer for the mean to find this answer. Bound to four decimal places as needed