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Posted by on Tuesday, October 5, 2010 at 2:12pm.

A survey found that 25% of pet owners had their pets bathed professionally rather than do it themselves. If 18 pet owners are randomly selected, find the probability that exactly 5 people have their pets bathed professionally.

  • statistics - , Tuesday, October 5, 2010 at 8:50pm

    Use a binomial probability function table. Values to look up are: p = .25, n = 18, and x = 5.

    Or...

    Calculate it by hand:
    P(x) = (nCx)(p^x)[q^(n-x)]
    ...where q = 1 - p.

  • statistics - , Wednesday, June 5, 2013 at 7:42pm

    75

  • statistics - , Tuesday, June 11, 2013 at 1:45pm

    0.199

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