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Math Help - P-value

  1. #1
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    P-value

    On a summer day it says that the probability that a hot dog stand will sell out of hot dogs is 3/5
    find at least 70 of 100 days the hotdogs are sold out

    I used 1-Binomcdf(100, (3/5), 70) then this gives me an answer that is not a choice.
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  2. #2
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    Quote Originally Posted by IDontunderstand View Post
    On a summer day it says that the probability that a hot dog stand will sell out of hot dogs is 3/5
    find at least 70 of 100 days the hotdogs are sold out

    I used 1-Binomcdf(100, (3/5), 70) then this gives me an answer that is not a choice.
    At least means 70 or more.

    X ~ Binomial(n = 100, p = 3/50 and your job is to calculate \Pr(X \geq 70) = 1 - \Pr(X \leq {\color{red}69}).
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  3. #3
    MHF Contributor matheagle's Avatar
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    most likely you're expected to approximate this with a normal distribution with

    P(Normal >69.5)
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  4. #4
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    Quote Originally Posted by matheagle View Post
    most likely you're expected to approximate this with a normal distribution with

    P(Normal >69.5)
    Not this time. The Binomcdf command mentioned in the original post suggests using a TI graphics or CAS calculator here.
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  5. #5
    MHF Contributor matheagle's Avatar
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    I don't own any of these calculators, so I had no idea what that meant.
    The most scientific one I use is a TI-30.
    I had a fancier one that did all these percentiles, but I gave that to a grad student last year as a graduation gift.
    I just googled binomial calculator and came across
    Binomial Probability Calculator
    These can be found all over the net.
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