Posted by **Aleah** on Friday, October 9, 2009 at 10:58pm.

The mean systolic blood pressure of adult males is normally

distributed with a mean of 138 (millimeters of

mercury) and a standard deviation of 9.7. What percent

of adult males have blood pressure between 161.28 and

164.9?

- math -
**MathMate**, Friday, October 9, 2009 at 11:09pm
Find the number of standard deviations from the mean (above) for each of the limits. For example, (161.28-138)/9.7 = 2.4

So look up the normal distribution table and find the fraction (out of 1) that is between the two limits, +2.4 σ and +____ σ.

Change the fraction to percent.

- math -
**Aleah**, Saturday, October 10, 2009 at 12:04am
Is the answer 5%?

- math -
**MathMate**, Saturday, October 10, 2009 at 6:35am
Yes, that is correct, well done.

It would be nice if you could get a more accurate table to get a number like 5.x%.

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