A probability problem by michael tesfa

Probability Level 1

Mr. Smith has two children. If the older child is a boy, what are the odds that the other child is also a boy.

33% 66% 25% 50%

Michael Tesfa by michael tesfa , 17, USA

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2 solutions

Zach Abueg
Apr 26, 2017

A newborn's gender is independent of the genders of its siblings, so the probability that it is male is treated as its own probability.

P ( b o y ) = 1 2 \displaystyle P(boy) = \frac 12

2 Helpful 0 Interesting 0 Brilliant 0 Confused
Michael Tesfa
Apr 25, 2017

Since there are two genders, there is a 50% chance that the other child it a girl or a boy.

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