If you arent sure if its correct dont answer i will thumbs down they already answered incorrect last time.

A quality control inspector at the Beautiful Shampoo Company has taken three samples with four observations each of the volume of shampoo bottles filled. The data collected by the inspector and the computed means are shown here: If the standard deviation of the shampoo bottle-filling operation is 0.2 ounces, use the information in the table to develop control limits of 3 standard deviations for the operation: (Round answers to 2 decimal places, e.g. 15.25.)