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posted by Anonymous

A random sample of mid-sized cars tested for fuel consumption gave a mean of miles per gallon with a standard deviation of miles per gallon.

Assuming that the miles per gallon given by all mid-sized cars have a normal distribution, find a confidence interval for the population mean, .

Round your answers to two decimal places.

  1. MathGuru

    Use a confidence interval formula for the data.

    Here is an example of one for a 95% confidence interval:

    CI95 = mean ± 1.96 (sd/√n)

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