Question : Study the given table and answer the question that follows.
| Number of children | Number of families |
| 0 | 4 |
| 1 | 22 |
| 2 | 15 |
| 3 | 6 |
| 4 | 2 |
The average number of children per family is :
Option 1: 1.47
Option 2: 1.59
Option 3: 1.23
Option 4: 1.72
Correct Answer: 1.59
Solution :
Average number of children per family
$=\frac{\sum{\text{Number of children}\times\text{Number of families}}}{\sum{\text{Total number of families}}}$
$=\frac{0\times4+1\times22+2\times15+3\times6+4\times2}{4+22+15+6+2}$
$=\frac{22+30+18+8}{49}$
$=\frac{78}{49}$
$=1.59$
Hence, the correct answer is 1.59.
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