Question : The following bar graph shows the production of pens (in lakhs) by three companies M, N, and O from 2018 to 2022.
What is the ratio of the average production of Company O in the period 2019–2021 to the average production of Company M in the same period?
Option 1: 55 : 46
Option 2: 66 : 79
Option 3: 64 : 73
Option 4: 64 : 65
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Correct Answer: 64 : 73
Solution :
Average = $\frac{\text{Sum of all the entries}}{\text{Total number of entries}}$
From the given graph,
⇒ Average production of Company O in the years 2019 - 2021 $=\frac{15+18+31}{3}=\frac{64}{3}$
And, Average production of Company M in the years 2019 - 2021 $=\frac{21+33+19}{3}=\frac{73}{3}$
⇒ Ratio $=\frac{64}{3}:\frac{73}{3}=64:73$
Hence, the correct answer is 64 : 73.
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