# In a certain class room

• Dec 29th 2009, 07:19 PM
zorro
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 :
• Dec 29th 2009, 07:29 PM
ANDS!
What have you tried Zorro - this is an incredibly basic question.
• Dec 29th 2009, 07:31 PM
pickslides
Let A be the probabilty of wearing glasses and let B be the probabilty of being a girl

Now $P(A/B) = \frac{P(A\cap B)}{P(B)}$
• Dec 29th 2009, 07:35 PM
zorro
---------------------------------My work ------------------------------------

Pr(E) : - Prob of eyeglases
Pr(G) : - prob of girl
$P(E/G) = \frac{Pr(E \cap G)}{P(G)} = \frac{\frac{16}{100}}{\frac{40}{100}} = \frac{16}{40}= \frac{2}{5}$.........Is this correct??????
• Dec 29th 2009, 07:39 PM
pickslides
I like it

(Beer)(Beer)(Yes)(Cake)(Evilgrin)(Beer)(Beer)
• Dec 29th 2009, 08:15 PM
zorro
Thanks young sky worker .........May the Force be with u
Cheers (Beer)
• Dec 29th 2009, 08:53 PM
pickslides
I'm pretty sure it's Skywalker..

(Thinking)
• Dec 29th 2009, 09:29 PM
zorro
ya it is sorry for the typo