Asked by jessica

assume that blood pressure readings are normally distributed with a mean of 111 and standard deviation of 7. A researcher wishes to select people for a study but wants to exclude the top and bottom 10 percent. What would be the upper and lower readings to qualify people to participate in the study?

Answers

Answered by Steve
the central 80% of the Z table lies within µ ± 1.282σ

So, plug in your numbers

You can play around with Z table stuff at this excellent site:

http://davidmlane.com/hyperstat/z_table.html
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