statistics, find the probability

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It is known that 77% of all new products introduced in grocery stores fail (are taken off the market) within 2 years. If a grocery store chain introduces 62 new products, find the following probabilities. (Round your answers to four decimal places.)

(d) within 2 years fewer than 10 succeed

  • statistics, find the probability -

    prob(fewer than 10 succeed) --> prob(none succeeds + one succeeds + 2 succeed + ...+ 9 succeed)
    = (.77)^62 + C(62,1)(.23)(.77^61) + C(62,2)(.23^2)(.77^60) + ... + C(62,9)(.23^9)(.77^53)
    = ....

    lots of button-pushing here

  • statistics, find the probability -

    When I computed this, it came out very oddly.. The C is throwing me off. cNr?

  • statistics, find the probability -

    Yes
    C(n,r) = nCr
    = n!/(r!(n-r)!)

    e.g. C(62,2) = 62!/(2!60!) = 1891

    most calculators have the nCr key, mine is the 2nd function of the 5 key

    e.g. to find C(62,2)

    enter:
    62
    nCr
    2
    =

    to get 1891

    PS. I did not take the time to find the final answer to the above string of probabilities.

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