One side of a triangle is 15 inches, and the area of the triangle is 90 sq. inches. find the area of a similar triangle in which the corresponding side is 9 inches.

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”?