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14 January, 10:45

A credit card company has found that 0.1% of all transactions are fraudulent. It has developed a computer program that correctly identifies whether a transaction is fraudulent or not 99% of the time. If the program scans 5,000,000 transactions, about how many of them will it identify as fraudulent?

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  1. R
    14 January, 11:41
    0
    Given:

    0.1% of all transactions are fraudulent

    99% correct identification whether a transaction is fraudulent or not.

    Scanned 5,000,000 transactions.

    5,000,000 x 0.1% = 5,000 fraudulent transactions.

    For me, there are 5,000 fraudulent transactions. This is based on the 0.1% rather than the 99%. Because the problem clearly states that the 0.1% of ALL transaction is identified as fraudulent. The 99% of the computer program only deals with the correct identification of the transaction as either fraudulent or not. For me, it is not a clear measure of the true number of fraudulent transactions.
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