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Math Help - Genetic probability.

  1. #1
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    Genetic probability.

    What is the probability of obtaining at least 55 red blossomed plants when 75 plants are grown. (The probability of a red plant is .75 or 75%) This may be belong in basic...but I'm not getting any answers there.
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  2. #2
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    Quote Originally Posted by jebckr View Post
    What is the probability of obtaining at least 55 red blossomed plants when 75 plants are grown. (The probability of a red plant is .75 or 75%) This may be belong in basic...but I'm not getting any answers there.
    Let X be the random variable 'number of red bloosomed plants'.
    X ~ Binomial(n = 75, p = 0.75)
    Calculate Pr(X > 54).
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  3. #3
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    Yes, but won't I have to calculate it 55 differant times and then add it up? I feel like there is a simple equation for this situation, but it's been a while since I've had stats.
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    Quote Originally Posted by jebckr View Post
    Yes, but won't I have to calculate it 55 differant times and then add it up? I feel like there is a simple equation for this situation, but it's been a while since I've had stats.
    Google Binomial Theorem.
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