<PRE><B>Question 534028</B>
Assume the probability of having a boy is 50% and a girl is 50%. If a family has four children, what is the probability the family has at least two girls? Please show all work. 
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P(2 girls) = 4C2(1/2)^2*(1/2)^2 = 6/16
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P(3 girls) = 4C3(1/2)^2*(1/2) = 4/16
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P(4 girls) = 4C4(1/2)^4 = 1/16
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P(2&lt;- x &lt;= 4) = 11/16
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Cheers,
Stan H.</PRE>