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23-04-2015
Mathematics

Answered

in a family of 4 children, what is the probability that all four will be girls ?

Answer :

23-04-2015

Assume that the probability of either gender of a newborn is 50-50.

Then ...
The probability of the first child being a girl is 0.5 .
The probability of the second child being a girl is 0.5 .
The probability of the third child being a girl is 0.5 .
The probability of the fourth child being a girl is 0.5 .

The probability of all four being girls is (0.5) x (0.5) x (0.5) x (0.5) =

(0.5)⁴ = 0.0625 = 6.25% = 1/16 .

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