SOLUTION: Students scoring the lowest 5% on a graduation exam are given additional assistance after school. If the average score is 720 with a standard deviation of 80, what is the cutoff s

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Question 425124: Students scoring the lowest 5% on a graduation exam are given additional assistance after school. If the average score is 720 with a standard deviation of 80, what is the cutoff score for a student to receive assistance?

Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Students scoring the lowest 5% on a graduation exam are given additional assistance after school. If the average score is 720 with a standard deviation of 80, what is the cutoff score for a student to receive assistance?
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Find the z-score with a left-tail of 5%.
invNorm(0.05) = -1.645
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Solve for "x":
x = -1.645*80+720 = 588.41
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Cheers,
Stan H.