Posted by **Huffette** on Sunday, December 2, 2012 at 7:16pm.

A set of 50 data values has a mean of 48 and a variance of 9.

I. Find the standard score (z) for a data value = 43.

II. Find the probability of a data value < 43.

- Homework Help -
**PsyDAG**, Tuesday, December 4, 2012 at 1:26pm
Z = (score-mean)/SD

SD = √variance

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability related to the Z score.

- Statistics -
**PsyDAG**, Tuesday, December 4, 2012 at 1:27pm
Indicate your subject in the "School Subject" box, so those with expertise in the area will respond to the question. You lucked out this time.

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