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March 30, 2015

March 30, 2015

Posted by **SHA** on Saturday, November 19, 2011 at 8:57pm.

- statistics -
**PsyDAG**, Sunday, November 20, 2011 at 4:02amIt would help if you proofread your questions before you posted them.

You probably have a typo. With SD = 140, one SD below the mean (90) would be -50. This means that you do not have a normal distribution.

However, if the distribution is normal,

Z = (score-mean)/SD

Insert the correct values to find Z.

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportions related to your Z scores.

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