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    French Fries - Normal Distribution

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    The lengths of 45 French fries, randomly selected from a huge shipment, were measured and a mean length of 8.4 cm with standard deviation of 3.1 cm was found.
    a. Construct a 95% confidence interval for the population mean length of a French fry.
    b. Calculate the number of French fries that would have to be sampled and measured to be 98% sure of being within 0.4 cm of the true mean.

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    Solution Preview

    The solution file is attached.

     = 8.4,  = 3.1, n = 45

    (a) The 95% confidence interval ...

    Solution Summary

    The confidence interval has been constructed and the sample size determined.