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Math Help - Probability and Benford's Law

  1. #1
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    Probability and Benford's Law

    For this problem, Benford's law should be known (Benford's law - Wikipedia, the free encyclopedia).

    The problem:
    Assume that Benford's law is true in the following situations.
    a) In a list you find 125 amounts. Caculate the probability that less than 20% of those amounts begin with a 1.
    b) Every day, a warehouseman fills out a form with the number of transactions he performed that day. At the end of a quarter he has submitted 80 forms. Calculate the probability that on those forms, at least 10% of the transactions begin with a 9.

    I don't really know how start tackling these kind of problems. Does anybody have a good resource to practice the needed skills for these problems? And can somebody explain how to do these problems? I have practiced permutations, combinations, and basic probabilities (like number of successes divided by total number)

    Thanks!
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  2. #2
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    Re: Probability and Benford's Law

    Somebody?
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