Solve for x: two fifths(x − 2) = 4x. x = two ninths x = −2 x = negative two ninths x = negative nine halves

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”?