donr know how to do this one cant do my excel righr help?

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.) 54 53 6765 51 67 70 63 53 55 74 51 67 60 75 67 72 75 64 52 Meantime Variance Standard deviation