Find the missing term in the following geometric sequence. 4 500 a. 12, 144 c. 20,100 b. 40, 200 d. 32, 200

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”?