Question
The distribution of scores on a standardized aptitude test is approximately normal with a mean of 490 and a standard deviation of 95. What is the minimum score needed to be in the top 25% on this test? Carry your intermediate computations to at least four decimal places, and round your answer to the nearest integer.
Answers
PsyDAG
Z = (score-mean)/SD
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion (.25) in smaller portion to get the Z score. Insert values in the equation above.
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion (.25) in smaller portion to get the Z score. Insert values in the equation above.