Question

Mr.x and mrs x have seven children, female to male ratio in a family is 1:2, probability of child either girl or boy

Answer 1

Answer:

A=2/7

B=5/7

Step-by-step explanation:

Total children=7

let total girl children=A

let total boy children=B

So, A+B=7

total female in family=A+Mrs x=A+1

total male in family=B+Mr. x=B+1

female:male=1:2=A+1:B+1

1k/2k=(A+1)/(B+1)

So,  1k=A+1 and 2k=B+1

A=1k-1  and  B=2k-1

A+B=7⇒1k-1+2k-1=3k-2

7=3k-2

9=3k

k=3

Put k=3 in

A=1×3-1=3-1=2

B=2×3-1=6-1=5

Probability of girl child=2/7

Probability of boy child=5/7

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