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    Normal Approximation to Binomial Distribution

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    Of the total population of American households, including older Americans and perhaps some not so old, 17.3% receive retirement income. In a random sample of 120 households, what is the probability that greater than 20 households but less than 35 households receive a retirement income?

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    Solution Summary

    The solution provides step-by-step method for the calculation of probability using the Z score. Formula for the calculation and interpretations of the results are also included.