Which expression is equivalent to the one below?

For the equations below which statement is true ?

If 1/√5+1/√5+1=p+q√r , find the values of p, q and r

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%