Question

the admissions policy at a certain university requires that incoming students score in the upper 20% on a standardized test. if the mean score on the test is 510 and the standard deviation of the scores is 80, what is the minimum score that a student can earn on the test to meet the admissions requiremnt? Scores on the test are normally distributed and are reported in intervals of 10.

Answer 1

z = (score - mean)/ standard deviation

1)Refer to the z-score chart. Look up the +z-score corresponding to a p-value of ~.8
2)Find score and round up to the nearest 10 interval.

Answer 2

520