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Posted by 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 - , 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 - , Saturday, October 10, 2009 at 12:04am

    Is the answer 5%?

  • math - , 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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