New paint has recently been developed by a research laboratory. Forty-one gallons are tested and the mean coverage is found to be 515 sq ft/gal with a standard deviation of 50 sq ft/gal. Find a 99%...

New paint has recently been developed by a research laboratory. Forty-one gallons are tested and the mean coverage is found to be 515 sq ft/gal with a standard deviation of 50 sq ft/gal. Find a 99% confidence interval estimate for the mean coverage per gallon of all such paint.