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In a large city, you pick a sample of 30 of lawn mowings during summer whose standard deviation is 7.7. The margin of error for

In a large city, you pick a sample of 30 of lawn mowings during summer whose standard deviation is 7.7. The margin of error for a 90% confidence interval will be

2.3885 (correct answer)

When I calculated the problem to find margin of error, I got 2.31257. Need help.

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