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Math Help - probability

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    probability

    A couple has six children. Assuming boys and girls are equally likely, what is the probability that they have fewer than 4 girls?
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    Quote Originally Posted by sftball View Post
    A couple has six children. Assuming boys and girls are equally likely, what is the probability that they have fewer than 4 girls?
    Let X be the random variable number of girls.

    X ~ Binomial(n = 6, p = 1/2).

    Calculate Pr(X < 4) = 1 - \Pr(X \geq 4).
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    Thankyou...
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