# Thread: In a certain class room

1. ## In a certain class room

Question : In a certain class , consisting of 60 boys and 40 girls, it is observed that 24 boys and 16 girls wear eyeglasses. What is the probability that a student picked at random wears eyeglasses , given that the student is a girl .
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Solution :

2. What have you tried Zorro - this is an incredibly basic question.

3. Let A be the probabilty of wearing glasses and let B be the probabilty of being a girl

Now $\displaystyle P(A/B) = \frac{P(A\cap B)}{P(B)}$

4. ---------------------------------My work ------------------------------------

Pr(E) : - Prob of eyeglases
Pr(G) : - prob of girl
$\displaystyle P(E/G) = \frac{Pr(E \cap G)}{P(G)} = \frac{\frac{16}{100}}{\frac{40}{100}} = \frac{16}{40}= \frac{2}{5}$.........Is this correct??????

5. I like it

6. Thanks young sky worker .........May the Force be with u
Cheers

7. I'm pretty sure it's Skywalker..

8. ya it is sorry for the typo