What is the length of DT where D(-6-2) and T(7-8)

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%

Divide. write in simplest form 41/6 divided by 10

Ineed to know the answer to this algebra question.