The population proportion of 5 year old's who live with only one parent, for city & sample is 0.350 & 0.371 respectively.
Explanation:
We have , In one city, there are a total of 1704 , 5 year old children of whom 598 live with one parent only. Among a sample of 606 of the 5 year old children from this city, 225 live with one parent only.
Population proportion is the ratio of Number of 5 year old child's with one parent only to Total Number of 5 year old children. i.e.

Population proportion for city:

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Population proportion for sample:

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∴ The population proportion of 5 year old's who live with only one parent, for city & sample is 0.350 & 0.371 respectively.