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.) 67 69 54 7173 58 71 54 62 67 62 57 67 60 65 60 63 72 56 64 64 6 Mean time Variance Standard deviation 5.02