HALP PLZ

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%

Which is the scale factor proportion for the enlargement shown?

Write the point-slope form of an equation of the line through the points (-2, -3) and (-7, 4).