what is the equation of the graphed linear model? y = x + scatter plot ona a first quadrant coordinate grid. the horizontal axis is labeled variable a the verticale axis is labeled variable b. points are plotted at (1,,,6),411). a line is dwrawn through points (1,3) and (9,11)

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%