Use the margin of error E = $139, confidence level of 99%, and a^{–} = $513 to find the minimum sample size needed to estimate an unknown population mean, p.

**Solution: **Again, we know that

_{}

This means that

_{}

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Use the margin of error E = $139, confidence level of 99%, and a^{–} = $513 to find the minimum sample size needed to estimate an unknown population mean, p.

**Solution: **Again, we know that

_{}

This means that

_{}