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A college professor noted that the grades of his students in an introductory statistics class were normally distributed with a mean of 26.50 and a

A college professor noted that the grades of his students in an introductory statistics class were normally distributed with a mean of 26.50 and a standard deviation of 9. If 67.38% of his students received grades of C or above, what is the minimum score of those students receiving a grade of at least a C?

a. 67.38

b. 22.45

c. 16.56

d. 20.00

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