Step 1:** Calculate the z-score for the sample mean of 58,600 miles using the formula:
\[ z = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}} \]
where:
- \( X = 58,600 \) miles (sample mean)
- \( \mu = 60,000 \) miles (population mean)
- \( \sigma = 1400 \) miles
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