Question : The table given below shows the income and expenditure of five companies.
What is the difference between average income and average expenditure of all the companies?
Option 1: 4.2
Option 2: 6.6
Option 3: 2.6
Option 4: 8.4
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Correct Answer: 6.6
Solution : We know the formula, Average = $\frac{\text{Sum of all values}}{\text{The total of all values}}$ The average income of all the companies = $\frac{55+50+35+40+60}{5}=\frac{240}{5}$ The average expenditure of all the companies = $\frac{50+40+32+35+50}{5}=\frac{207}{5}$ The difference between the average income and average expenditure of all the companies $=\frac{240}{5}-\frac{207}{5}=\frac{33}{5}=6.6$ Hence, the correct answer is 6.6.
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