SOLUTION: Student population of 4000 take a test. The mean is 610 and standard deviation is 60. How many students score 570 or higher?
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Question 934850: Student population of 4000 take a test. The mean is 610 and standard deviation is 60. How many students score 570 or higher? Answer by rothauserc(4718) (Show Source):
You can put this solution on YOUR website! Pr(X>570) = 1 - Pr(X<570)
calculate z-score for Pr(X<570)
z-score = (570 - 610) / 60 = −0.666666667 approx -0.67
Pr(X>570) = 1 - Pr(X<570) = 1 - 0.2514 = 0.7486
now 4000 * 0.7486 = 2994.4 = 2994 students
