Choose the option that correctly completes the statement. the measure of an exterior angle of a triangle is the sum of the measures of the remote interior angles. less than greater than equal to

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”?