The time in seconds it takes for 20 individual sewing machines to stitch a border onto a particular garment is listed below. Calculate the mean stitching time, the variance, and the standard deviation. (Round the "mean time" and "variance" to the nearest tenth and "standard deviation" to the nearest hundredth.) 56 57 68 56 66 52 54 64 64 67 73 50 73 65 73 65 53 69 65 51 X Answer is complete but not entirely correct. Mean time 62.1 Variance 59.5 Standard deviation 7.72 X