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In a certain country, the probability that a baby that is born is a boy is 0.52 and the probability that a baby that is born is a girl is 0.48. A family has two children. If X is the number of girls born to a family, find the probability that the family has 0, 1, or 2 girls.

 

Create the binomial distribution table for P (X).

 

You put this as the answer but on P(1 girl )   = 2C1 * (.52)(.48) ≈ .50, there's a C between the 2 and 1, what does that mean?

 

P(0 girls)  = (.52)^2  ≈ .27

P(1 girl )   = 2C1 * (.52)(.48) ≈ .50

P(2 girls)  = (.48)^2   ≈ .23

 

 

Thanks so much!

 Apr 15, 2019
 #1
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2C1   means " two choose one"

 

In this case....we could have a girl either born first or second...choose either

 

 

coolcool cool

 
 Apr 15, 2019
edited by CPhill  Apr 15, 2019
 #2
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Ohhhh okay makes sense! Thank you!

 
Guest Apr 15, 2019

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