Question : The following table shows the income (in Rs.) of five different persons ( A, B, C, D, E ) over given 4 years.
Find the average income of the five persons in the year 2015.
Option 1: Rs. 12,600
Option 2: Rs. 12,400
Option 3: Rs. 12,700
Option 4: Rs. 12,500
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Correct Answer: Rs. 12,400
Solution : Average = $\frac{\text{Sum of all the observations}}{{\text{Total number of observations}}}$ So, the average income in 2015 is: $ = \frac{12000 + 10000 + 5000 + 20000 + 15000}{5} = \frac{62000}{5} = 12,400$ Hence, the correct answer is Rs. 12,400.
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