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Normal Distribution

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A tornado has blown through a section of Collinsville. The insurance adjuster wants to estimate the average claim to within $500. If the standard deviation is believed to be $1600 and the company wants to be 99% sure of their figures, how large a sample must be taken?

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The normal distribution in a large sample are provided. The solution answers the question(s) below.

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Please see the attachment.

From the condition, we know
The marginal ...

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