On his sport team, the mean height is 71 in, and the standard deviation is 3 in.
Jeff's height is 76 in.
In his sport team, the mean height is 73 in, and the standard deviation is 2.8 in.
Chris' height is 75 in.
In his sport team, the mean height is 69 in, and the standard deviation is 2.6 in.
Is any of them unusually tall in his sport team? Justify your answer.