In four schools B1,B2,B3,B4 the percentage of girls students is 12, 20, 1

Discussion Forum : Probability I

Question -

In four schools $B_{1}, B_{2}, B_{3}, B_{4}$ the percentage of girls students is 12, 20, 13, 17 respectively. From a school selected at random, one student is picked up at random and it is found that the student is a girl. The probability that the school selected is $B_{2}$ , is

Options:

A .

\frac{6}{31}

B .

\frac{10}{31}

C .

\frac{13}{62}

D .

\frac{17}{62}

Answer: Option B
:
B
Favorable number of cases =

^{20} C_{1} = 20

Sample space =

^{62} C_{1} = 62

∴

Required probability =

\frac{20}{62} = \frac{10}{31}

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