Scores on a university exam are Normally distributed with a mean of 78 and a standard deviation of 8. The professor teaching the class declares that a score of 70 or higher is required for a grade of...

Extracted text: Scores on a university exam are Normally distributed with a mean of 78 and a standard deviation of 8. The professor teaching the class declares that a score of 70 or higher is required for a grade of at least "C." What percentage of students earn a grade of at least "C"? The percentage is about а. 38% b. 32% С. 68% O d. 84% е. 5% O f. 16% g. 49%