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1. Study the following graph carefully and answer the given questions.

Which company has the highest average production over the three years?

A. Company A

B. Company C

C. Company D

D. Company B

Solution:

\begin{aligned} A = \frac{20 + 30 + 20}{3} \\ = \frac{70}{3} \\ = 23.33 \\ B = \frac{40 + 30 + 50}{3} \\ = \frac{120}{3} \\ = 40 \\ C = \frac{20 + 20 + 40}{3} \\ = \frac{80}{3} \\ = 26.66 \\ D = \frac{60 + 30 + 40}{3} \\ = \frac{130}{3} \\ = 43.33 \end{aligned}

So company D has the highest production.

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