Homework Help: statistics

Posted by Michelle on Tuesday, November 20, 2012 at 3:00pm.

Entry to a certain University is determined by a national test. The scores on this test are normally distributed with a mean of 500 and a standard deviation of 100. Tom wants to be admitted to this university and he knows that he must score better than 70% of the students who took the test. What should Tom's score at least be in order to be admitted.
NOTE: WRITE YOUR ANSWER USING 4 DECIMAL DIGIT. FOR EXAMPLE 0.1234 OR 3.2450. DO NOT ROUND UP OR DOWN THE LAST DECIMAL DIGIT.

statistics - dick, Wednesday, November 21, 2012 at 12:46pm
42324213
statistics - PsyDAG, Wednesday, November 21, 2012 at 12:50pm
Z = (score-mean)/SD

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion (.70) in larger portion and its Z score. Insert the Z score in the above equation to find the score.
statistics - Anonymous, Wednesday, November 21, 2012 at 1:18pm
so the equation would be..

.7580=(x-500)/100

but i'm not getting a clear answer.

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