Math - Data Management

If we take a sample of 2400 families with five children,
a) what is the probability that a family will have exactly 2 girls?
b) How many of the families would you expect to have exactly two girls?

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3. 👁 104
1. Binomial distribution gives us

5C2*(.5)²(.5)³
=10(.5)^5
=0.3125

E(x)=2400*0.3125=750

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posted by MathMate

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