Question : The following table shows the income (in Rs.) of five different persons ( A, B, C, D, E ) over given 4 years.
| Years | 2015 | 2016 | 2017 | 2018 |
| A | 12000 | 12500 | 13000 | 13500 |
| B | 10000 | 11000 | 12000 | 13000 |
| C | 5000 | 6000 | 7000 | 8000 |
| D | 20000 | 25000 | 30000 | 35000 |
| E | 15000 | 16000 | 17000 | 18000 |
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
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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