there are 6 girls and 4 boys in a class. what is the probability that a student chosen at random is a 12 year old girl

Question

anonymous · Answer

60% because in total there are 10 people

thomaster · Answer

You cannot tell because you don't know the ages of the 10 people xD
You can say it's a 60% chance that it will be a girl but not age 12

anonymous · Answer

a 0.18
b 0.3
c 0.45
d 0.9

ash2326 · Answer

We should account that a girl has to be chosen first, then only she can be 12 or not
Probability of choosing a girl
$$P(G)=\frac{6}{10}=0.6$$
probability that she is 12 years old
$$P(12)=0.5$$

Probability of choosing a 12 year girl
$$P=P(G)\times P(12)=0.6\times 0.5=0.3$$

anonymous · Answer

@ash2326 yes :)

ash2326 · Answer

@edensleka do you get this?

ash2326 · Answer

@perurabo yes, you can. Start it as a new post.

anonymous · Answer

p=\frac{ 6 }{ 10 }=\frac{ 3 }{ 5 }\]

anonymous · Answer

p=3/5

kropot72 · Answer

The distribution of ages among the girls is not given in the question. If there were no 12 year old girls, the probability of choosing a 12 year old girl would be zero. If all the girls were 12 years old, the probability of choosing a 12 year old girl would be 0.6.

Therefore there is not enough information in the question to enable an answer to be given.