Post-UTME Mathematics 2017 Objective — Question 33

The table shows Sabra's grades for a class (Quiz Average 83%, Test Average 79%, Final Exam 88%). For her overall average, the test average counts twice as much as the quiz average, and the final exam counts twice as much as the test average. Sabra uses (83+79+79+88+88+88+88)÷7. Which of the following is another way to find her overall average?

• A. 83 + 2(79) + 4(88), all over 7Correct
• B. 83 + 0.2(79) + 0.4(88)
• C. [83 + 2(79) + 4(88)] ÷ 0.7
• D. [83 + 2(79) + 4(88)] ÷ 1/7 / E. [83 + 2(79) + 4(88)] x 1/7