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 = (scoremean)/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?