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Math Help - probability

  1. #1
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    probability

    i am having problems with those 2 kestions...

    1. in order to verify the accuracy of their financial accounts, companies use auditors on a regular basis to verify accouting entries. the company's employees make erroneous entries 5% of the time. Suppose that an auditor checks three entries.
    Find the probability distribution for Y, the number of errors detected by the auditor.



    2. A heavy-equipment salesperson can contact either one or two customers per day with probability 1/3 and 2/3 respectively. each contact will result in either no sale or a sale of 50 000$, with probability 0.9 and 0.1 respectively. give the probability distribution for daily sales. find the mean and the standard deviation of the daily sales.


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  2. #2
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    Quote Originally Posted by calculator101 View Post
    i am having problems with those 2 kestions...

    1. in order to verify the accuracy of their financial accounts, companies use auditors on a regular basis to verify accouting entries. the company's employees make erroneous entries 5% of the time. Suppose that an auditor checks three entries.
    Find the probability distribution for Y, the number of errors detected by the auditor.

    Mr F says: See post #3 here: http://www.mathhelpforum.com/math-he...variables.html


    2. A heavy-equipment salesperson can contact either one or two customers per day with probability 1/3 and 2/3 respectively. each contact will result in either no sale or a sale of 50 000$, with probability 0.9 and 0.1 respectively. give the probability distribution for daily sales. find the mean and the standard deviation of the daily sales.

    Mr F says: Read this thread: http://www.mathhelpforum.com/math-he...deviation.html

    ..
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