As per divergence function, ∇ (F x G) = ? A. G. (∇xF) - F. (∇xG)
B. G. (∇xF)-F.(∇xG)
C. G.(∇.F)-F.(∇.G)
D. None of these

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%