Determine whether the following regular polygon tessellates the plane. Explain. equilateral triangle

a. yes; measure of interior angle = 60
b. no; measure of interior angle = 60
c. yes; measure of interior angle = 120
d. no; measure of interior angle = 120

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%