In four schools B1,B2,B3,B4 the percentage of girls students is 12, 20, 13,

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 . 631

B . 1031

C . 1362

D . 1762

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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