An assembly-line machine turns out washers with the following thickness. Find the mean and standard deviation of the thicknesses 1.78, 1.75,

An assembly-line machine turns out washers with the following thickness. Find the mean and standard deviation of the thicknesses 1.78, 1.75, 2.07, 1.62, 1.76, 2.03, 1.54, 1.66, 1.85, 1.27, 2.02, 1.97, 1.77, 1.78, 1.51