Posted by **Bridget** on Tuesday, April 3, 2012 at 10:20pm.

A mean score on a standardized test is 50 with a standard deviation of 10. Answer the following

a. What scores fall between –1 and +1 standard deviation?

b. What percent of all scores fall between –1 and +1 standard deviation?

c. What score falls at +2 standard deviations?

d. What percentage of scores falls between +1 and +2 standard deviations?

IF THERE IS A FORMULA CAN YOU PROVIDE IT.

- MATH -
**PsyDAG**, Thursday, April 5, 2012 at 1:01pm
Z = (score-mean)/SD

Z = raw scorre interms of standard deviations.

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. Insert into equation above.

- MATH -
**Cynthia**, Saturday, October 19, 2013 at 6:54pm
What percentage of scores falls between +1 and +2 standard deviations?

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