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In a certain town, there are 25,000 households. On the average, there are 1.2 color TV sets per household, with a SD of 0.6; but

In a certain town, there are 25,000 households. On the average, there are 1.2 color TV sets per household, with a SD of 0.6; but 10% of the households do not have color TV. As a part of a market survey, a simple random sample of 900 household is drawn from 25,000. What is the chance that somewhere between 9% and 11% of the sample households will not have color TV?

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