<PRE><B>Question 1178696</B>
&lt;br&gt;
The number of girls in 10 births is either less than 5, or equal to 5, or more than 5:&lt;br&gt;
P(less than 5 girls)+P(5 girls)+P(more than 5 girls) = 1&lt;br&gt;
Because the probabilities for male or female are the same,&lt;br&gt;
P(less than 5 girls) = P(more than 5 girls)&lt;br&gt;
So&lt;br&gt;
2*P(less than 5 girls) = 1-P(5 girls)
P(less than 5 girls) = (1-P(5 girls))/2&lt;br&gt;
P(5) = C(10,5)*(0.5)^10 = 0.246 (to 3 decimal places)&lt;br&gt;
P(less than 5 girls) = (1-0.246)/2 = 0.377&lt;br&gt;
P(at most 5 girls) = P(less than 5 girls)+P(5 girls) = 0.377+0.246 = 0.623&lt;br&gt;
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