Terri played 70 tournament chess games during the school year and won 49 of them. what is her win-to-loss ratio? a. 3: 10 b. 7: 3 c. 7: 10 d. 49: 70

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%