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The difference between average demand and average production of the five...

This question belongs to Data Interpretation Bar Chart
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Directions(1 - 4): Study the bar diagram and answer the following questions.
Demand and production of colour TV of five companies A, B, C, D, and E.
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The difference between average demand and average production of the five companies taken together is:

Answer & Solution
Correct Answer: Option C
Required difference
= $$ \frac{3300 + 1200 + 3000 + 600 + 2500}{5}$$       $$ -\, \frac{2200 + 2700 + 1500 + 1800 + 1000}{5}$$
= 2120 - 1840
= 280
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