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December 20, 2014

December 20, 2014

Posted by **Lyndon** on Monday, July 26, 2010 at 7:02pm.

a. Scores greater than 85

b. Scores less than 100

c. Scores between 70 and 90

I believe this is the correct formula to start with but am unclear on how to finish it. Any help would be appreciated.

a. z = X-m= 85–80 = 5 = 0.25

s 20 20

b. z = X-m= 100–80 = 20 = 1.00

s 20 20

c. z = X-m= 70–80 = -10 = -0.25

s 20 20

z = X-m= 90–80 = 10 = 0.50

s 20 20

- Statistics -
**PsyDAG**, Tuesday, July 27, 2010 at 11:23amWhat does "s 20 20" mean?

Z = (x-mean)/SD

Type equation completely to avoid mistakes.

c. -10/20 = ?

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

I hope this helps.

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