Question 19
EasyOriginal questionA health worker recorded the number of children in each of 50 households of a village.
| Number of children | Number of households |
|---|---|
| 0 | 6 |
| 1 | 14 |
| 2 | 18 |
| 3 | 8 |
| 4 | 4 |
Using the village survey, what is the mean number of children per household?
Show the answer and explanation
CorrectNot quiteAnswer A
Correct answer: A
Explanation
Multiply each value by its frequency: .
Total households = .
Mean = .
Worth noting
2 is the plain average of the values 0 to 4, ignoring how many households have each. 3.6 divides 90 by 25, half the households, and 18 divides 90 by the 5 rows instead of by the 50 households.
- Concept
- Mean of a discrete frequency distribution: Σfx ÷ Σf
- Typical timeTypical
- 40 s
- Your timeYours
- —
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