Pls, help me I need the answer by 11 pm EST. Pls have a clear answer because I will report crazy-looking answers. Any questions ask in the comments. If you can't see it good, just ZOM INNN.

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.” using the 68-95-99.7 rule, what percentage of students failed to earn a grade of at least “c”?