Homework Help: math

Posted by Jennifer on Monday, November 28, 2011 at 2:38pm.

The average selling price of homes in a certain city is $356,300. Assume the variable is normally distributed with a standard deviation of $64,600. If 396 homes are for sale, how many homes will sell for more than $325,000? (Round up to the next whole number.)

math - PsyDAG, Tuesday, November 29, 2011 at 11:12am
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 that Z score. Multiply by 396.
math - PsyDAG, Tuesday, November 29, 2011 at 11:14am
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 that Z score. Multiply by 396.
math - Jennifer, Tuesday, November 29, 2011 at 12:44pm
Did I figure this right?
score-mean is 356,300/64,600(SD)= 5.515

My book says that any z values beyond 3.25 us a=0.500.

so I multiplied 0.500 by 396 = 198

I this correct?

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