What is the area of the triangle? A.) 12 squares meters
B.) 20 square meters
C.) 24 square meters
D.) 40 square meter

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”?