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Please help me solve this It is known that the standard deviation of vehicle speeds traveling along a particular stretch of freeway is 10.7 miles

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It is known that the standard deviation of vehicle speeds traveling along a particular stretch of freeway is 10.7 miles per hour, and the vehicle speeds are normally distributed. If a sample of 36 cars is taken, calculate the margin of error in estimating the true mean speed, with 95% confidence

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