In the following multiplication problem, the same letters represent the same digits, and different letters represent different digits. if the letter e represents the digit 1, what digit does the b represent ? abc x 7 cece

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”?