The distribution of scores on a standardized aptitude test is approximately normal with a mean of 520 and a standard deviation of 100. What is the minimum score needed to be in the top 20% on this test? Carry your intermediate computations to at least four decimal places, and round your answer to the nearest integer.© BrainMass Inc. brainmass.com March 4, 2021, 8:22 pm ad1c9bdddf
To be in top 20%, the area below the score should be 80%
Therefore we ...