SOLUTION: Students taking a college introductory statistics class reported spending and average of $305 on text books that quarter with a standard deviation of $90.
One student spends $287
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Question 720794: Students taking a college introductory statistics class reported spending and average of $305 on text books that quarter with a standard deviation of $90.
One student spends $287 on textbooks. What was her standard score? What percent of the students spent less than she did on textbooks that Quarter?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Students taking a college introductory statistics class reported spending and average of $305 on text books that quarter with a standard deviation of $90.
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One student spends $287 on textbooks. What was her standard score?
z(287) = (287-305)/90 = -0.2
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What percent of the students spent less than she did on textbooks that Quarter?
P(x < 287) = P(z < -0.2) = normalcdf(-100,-0.2) = 0.4207 = 42.07%
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Cheers,
Stan H.
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