Homework Help: MATH

Posted by Jen on Sunday, October 30, 2011 at 9:01pm.

A set of 50 data values has a mean of 18 and a variance of 4.
I. Find the standard score (z) for a data value = 20.
II. Find the probability of a data value < 20.

MATH - PsyDAG, Monday, October 31, 2011 at 2:00pm
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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