Question

(D)
family of 3 children, the probability of having at least one boy is.............



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Answer 1

Answer:

let,boy-b and girl -g

so the total outcomes are

gbb , ggg , gbg , ggb , bgg , bbg , bbb , bgb

favourable outcomes = 7

probability of getting atleat 1 boy =7/8

Step-by-step explanation:

Total children = 3

A child can be a boy or a girl

Probability of being a boy =

Probability of being a girl =

Formula :

Probability of success = p  = being a boy =  

Probability of failure = q = being a girl =  

n = 3

r = 0

So, probability of having at least 1 boy = 1 - prob. of having 0 boy = 1- 0.125 = 0.875

Hence probability of having at least 1 boy is 0.875

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