You need to buy the supplies to carpet a 15 foot by 14 foot room. the padding costs $0.89 per square foot and the carpeting costs $2.99 per square foot. you also need tack strips to go around the perimeter of the room that cost $0.19 per foot.

The first-serve percentage of a tennis player in a match is normally distributed with a standard deviation of 4.3%. if a sample of 15 random matches of the player is taken, the mean first-serve percentage is found to be 26.4%. what is the margin of error of the sample mean? a. 0.086% b. 0.533% c. 1.11% d. 2.22%