What is the simplest form of the expression sqrt 6x^8y^9/sqrt 5x^2y^4?

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%

Create a data set with 8 points in it that has a mean of approximately 10 and a standard deviation of approximately 1.

Can someone me out here number 4 plz