Posted by **Emory** on Friday, August 7, 2009 at 1:56pm.

The systolic blood pressures of the patients at a hospital are normally distributed with a mean of

136 mm Hg and a standard deviation of 13.4 mm Hg. Find the two blood pressures having these

properties: the mean is midway between them and 90% of all blood pressures are between them.

A) 123.9 mm Hg, 148.1 mm Hg

B) 118.8 mm Hg, 153.2 mm Hg

C) 114 mm Hg, 158 mm Hg

D) 115 mm Hg, 159 mm Hg

Is the answer B?

- Math 156 -
**Garcia**, Friday, August 7, 2009 at 5:06pm
Can some one give me some hints please..

- Math 156 -
**Emmanuel**, Thursday, March 22, 2012 at 9:10pm
The answer isn't even in your options; the correct answer is 119.9mm Hg, 160.1mm Hg.

- Math 156 -
**James**, Friday, January 30, 2015 at 12:47am
The correct answer is C.

You have to include the CI=90% which is a zscore = 1.645

Take the SD of 13.4 and multiply it by the zscore. Then subtract and add 136. Round up and the answer is C.

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