The fourth task force report on blood pressure control in children reports blood pressure norms for the children by age as well as sex group. The estimated mean +- standard deviation for 17 year old boys for DBP is 67.9+-11.6 mmHg based upon the large sample.
One approach for determining the elevated blood pressure is to employ 90mm Hg the standard for elevated adult DBP as the cutoff what percentage of 17 year old boys would be found to have elevated blood pressure using this approach?