A sum of $1290 is to be divided between two people in the ratio of 7 to 8. How much does each person receive?

27 is what percent of 108? 27 is % of 108

This is so hard and it’s for a test

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%