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    mean and variance

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    7) suppose the average weight of an item labeled 16 ounces actually has mean 17 ounces and variance 4 (ounce^2). What is the approximate probability that the combined weight of 25 items exceeds 445 ounces? What theorem is useful in answering this question?

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    https://brainmass.com/statistics/normal-distribution/mean-and-variance-10722

    Solution Preview

    This is a standard normal distribution theorem question
    E(X)=17 and Var(X)=4
    Then 25X is also a normal ...

    Solution Summary

    This shows how to find the probability that a weight is in a certain range given mean and variance.

    $2.49

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