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9. A meteorologist surveyed the wind speed of 1 1 tornadoes and found an average wind speed of 217.5 miles per hour with sample standard

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9. A meteorologist surveyed the wind speed of 1 1 tornadoes and found an average wind speed of 217.5 miles per hour with sample standard deviation of 41.4 miles per hour. Please find a 90% Confidence Interval for the true mean speed of a thunderstorm

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