What is the number of ways to arrange 8 objects from a set of 12 different objects? a. 19,958,400 b. 495 c. 24,861,300 d. 2,026

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”?