This semester, Mary had five quizzes that were each worth 10% of her grade. She scored 89, 74, 84, 92, and 90 on those five quizzes. Mary also scored a 92 on her midterm that was worth 25% of her grade, and a 91 on her final that was also worth 25% of her class grade. What was Mary's final grade in the class?

If Billy has an average of over 5 tests, what is the lowest score Billy can get over the next 3 tests in order to raise his average up to ?

A police officer walked into a room full of suspects and turn out their pockets. The chart below shows the number of coins each man had.

The police claim the man with the amount of money closest to the arithmetic mean of the group is guilty. Who is it?

If the average of 5k and 3l is equal to 50% of 6l, what is the value of k/l ?

What is the average (mean) of

What is the arithmetic mean of all of the odd numbers between 7 and 21, inclusive?

A, B, C, D, and E are integers such that A < B < C < D < E. If B is the average of A and C, and D is the average of C and E, what is the average of B and D?

The chart above lists the ages and heights of all the cousins in the Brenner family. What is the average age of the female Brenner cousins?

The mean of 12, 14, 18, 20, and x is equal to 14. Solve for x.

In a set of four numbers, the second is twice the size of the first, the third is two more than three times the size of the first, and the fourth is five times the third. In terms of x, what is the mean of these four numbers?