Compare 4: 10 and 12: 20 using fractions. which ratio is smaller? how do you know?

Arrange these numbers from least to greatest 3/5 5/7 2/9

Which fraction below is equivalent to 10/12?

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%