SOLUTION: The distribution of cholesterol levels in teenage boys is approximately normal with a mean of 170 and a standard deviation of 30. Levels above 200 warrant attention. (a)How many pe

Question 1187523: The distribution of cholesterol levels in teenage boys is approximately normal with a mean of 170 and a standard deviation of 30. Levels above 200 warrant attention. (a)How many percent of teenage boys has a cholesterol level greater than 200? (b) What is the highest cholesterol level of the bottom 14%

Answer by Theo(13342) (Show Source): You can put this solution on YOUR website!
mean is 170
standard deviation is 30.

percent above 200 is equal to 15.86552596.

highest cholesterol level of the bottom 14% is equal to 137.5904198.

i used the ti-84 plus calculator to get these results.

an online calculator that you can use to get similar results can be found at https://davidmlane.com/hyperstat/z_table.html

here are the results from using this calculator.

percent above 200 (they use ratio rather than percent.
ratio or proportion = percent divided by 100.

highest value of bottom 14%.

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