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Calculation of Arithmetic Mean – Individual
Observations
Q. 2. The following table gives the monthly
income of 5 families in a town:
| House
No |
1 |
2 |
3 |
4 |
5 |
| Income
(Rs.) |
780 |
760 |
690 |
750 |
840 |
Calculate the arithmetic mean of incomes.
Solution. Let the income be denoted by the
symbol X
| House No.
|
Monthly Income
X (Rs.) |
|
1 |
780
|
|
2 |
760
|
|
3 |
690
|
|
4 |
750
|
|
5 |
840
|
|
N = 5 |
å
X = 3820 |
Mean = å X/N
å X = 3820, N=5
Hence, mean = 3820/5 = 764
Thus, the average income is Rs. 764
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