Click on the graph below to create a quadrilateral with vertices at the following points
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So,first step is to write
Now we start from inner paranthesis
,we need to first find value of
You only need to consider the situations where 10 or 11 of the babies are girls, then subtract those probabilities from 1. This will give probability that any other number up to 9 of the babies are girls.
Use binomial theorem.
n = 11
k = 10,11
p = 1/2
Use binomial theorem.
n = 11
k = 10,11
p = 1/2