Total number of boys = 200
Number of left handed boys = 50
If a students is known to be a boy, the probability that he is left handed will be equal to = (Number of left handed boys) / (Total Number of boys)
So, If a students is known to be a boy, the probability that he is left handed will be =
Thus, the correct answer is option B
Number of left handed boys = 50
If a students is known to be a boy, the probability that he is left handed will be equal to = (Number of left handed boys) / (Total Number of boys)
So, If a students is known to be a boy, the probability that he is left handed will be =
Thus, the correct answer is option B