SOLUTION: The average college student's tuition in Arizona is $8000 per year with a standard deviation of $450. What is the probability that 81 Arizona students selected at random will have

Question 447823: The average college student's tuition in Arizona is $8000 per year with a standard deviation of $450. What is the probability that 81 Arizona students selected at random will have an average tuition greater than $8100?
Thank you!
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
The average college student's tuition in Arizona is $8000 per year with a standard deviation of $450. What is the probability that 81 Arizona students selected at random will have an average tuition greater than $8100?
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t(8100) = (8100-8000)/[450/sqrt(81)] = 2
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P(x > 8100) = P(t > 2 when df=80) = tcdf(2,100,80) = 0.02445
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Cheers,
Stan H.
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