The height of 14 year old boys in the u. s. is normally distributed with a mean of 64.5 and a standard deviation of 3.1 in what is the normal curve by entering the value of each standard deviation

I think you're missing the rest of the question, but you can use the standard deviation and a normal curve to determine the likelihood that they'll fall into particular ranges. I've included some below for you. 

61.4-67.6 - 68.37% likely to fall within this range. 
58.3-70.7 - 95.45% likely to fall within this range.
55.2-73.8 - 99.73% likely to fall within this range. 

There is no question, there is just the answer.