Posted by Anonymous on .
A district mathematics test for all third graders had a normal distribution with a mean of 74 and a standard deviation of 11. What percentage of the third graders tested scored with +1 and 1 standard deviation of the mean?

math 
Steve,
It doesn't matter what µ and σ are.
Your Z table will show you that 68.3% lie within 1σ of µ.