Mr. sanchez bought 2 magazines for $9.95 each and 1 book for $14.95. if the sales tax is 6%, what is the total cost of mr. sanchez’s purchases?

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%