Question

In a school there are 2000 students , out of which 1100 are girls. It is known that
out of 1100, 10% of the girls study in class XII . What is the probability that a
student chosen randomly studies in class XII given that the chosen student is a
girl​

Answer 1

Given  :  there are 2000 students , out of which 1100 are girls.

out of 1100, 10% of the girls study in class XII .

To Find : probability that a  student chosen randomly studies in class XII given that the chosen student is a  girl​

Solution:

Total Students = 2000

Total Girls = 1100

 out of 1100, 10% of the girls study in class XII

= (10/100) 1100

= 110

110 girls study in class XII

probability that a  student chosen randomly studies in class XII given that the chosen student is a  girl​  =  110/1100

= 1/10

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