Homework Help: statistics

Posted by Anonymous on Tuesday, November 8, 2011 at 1:09am.

Assume that blood pressure readings are normally distributed with a mean of 123 and a standard deviation of
9.6. If 144 people are randomly selected, find the probability that their mean blood pressure will be less than 125

statistics - PsyDAG, Tuesday, November 8, 2011 at 10:18am
Z = (mean1 - mean2)/SEm

SEm = SD/√n

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion related to the Z score.
statistics - Anonymous, Monday, March 19, 2012 at 10:58pm
0.9938
statistics - Anonymous, Monday, March 19, 2012 at 10:58pm
0.9938

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