Homework Help: Statistics

Posted by Josh on Tuesday, December 13, 2011 at 10:49pm.

9. Assume the weight, W, of a randomly selected adult has a normal distribution with a mean
of 175 pounds and a standard deviation of 10 pounds.. Find the probability, P(W < 190), that
a randomly selected adult weighs less than 190 pounds.

Statistics - bobpursley, Tuesday, December 13, 2011 at 11:39pm
http://davidmlane.com/hyperstat/z_table.html
Statistics - PsyDAG, Wednesday, December 14, 2011 at 10:27am
Another method.

Z = (score-mean)/SD

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.

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