SOLUTION: A professor at a local university noted that the grades of her students were normally distributed with a mean of 73 and a standard deviation of 11. If 69.5 percent of the students

Question 310744: A professor at a local university noted that the grades of her students were normally distributed with a mean of 73 and a standard deviation of 11. If 69.5 percent of the students received grades of C or better, what is the minimum score of those students who received grades of C or better?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
A professor at a local university noted that the grades of her students were normally distributed with a mean of 73 and a standard deviation of 11. If 69.5 percent of the students received grades of C or better, what is the minimum score of those students who received grades of C or better?
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Find the z-value that has a right tail of 0.695.
invNorm(0.3050) = -0.5101
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Find the corresponding grade:
x = zs + u
x = -0.5101*11+73
x = 67.39
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Cheers,
Stan H.
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