Suppose you measured the plasma BUN levels in a sample of several healthy people. You found that the mean (average) was 19.6 mg/dL and the standard deviation was 6.1 mg/dL. The histogram of the data showed roughly the bell curve shape. What percent of the whole population of healthy people has plasma BUN levels between 13.5 and 25.7 mg/dL?
Please select the single best answer