Question

If 21% of males and 15% of females in a given state play the guitar, what is the probability that a randomly selected subject in the state plays the guitar, given that the subject is male?

0.15
0.21
0.79
0.85

Answer 1

What do you think?

Answer 2

I think the answer is just 21% and that it is not a trick question :p

Answer 3

since 21% of males play the guitar ... then whats the probability that a male play the guitar?

Answer 4

Tbh I thought so too, but I figured it had to be a trick question. The lesson that came with this test didn't cover anything even closely related to this question, so I have no idea.

Answer 5

This is because the answer choices are 0.15, 0.21, 0.85 and 0.79.

0.15 cant be correct because thats the probability of a person playing guitar is female
0.85 cant be correct since 0.85 comes from 1 minus 15%.
0.79 cant be correct since 0.79 comes from 1 minus 21%

Answer 6

Dang untrick trick questions :p thanks for explaining it guys. Wish I could give both you guys medals.

Answer 7

this is a pretty crappy question but yeah it should just be 21%

Answer 8

21 percent literally mean: 21 out of 100, 21/100

Answer 9

It was. Well, it was 0.21, but same thing :p

Answer 10

yep you can always rule out the answers if they are obviously wrong lol!

Answer 11

male and guitar = .21 of the male population
female and guitar = .15 of the female population

Answer 12

.21n out of a population of n is just: .21n/n = .21

Answer 13

So yes it is .21

Answer 14

jchick, i think he understands, he just wasnt sure if it was a trick question or not since the last part was worded poorly.

Answer 15

Yes I agree I just need to always show work.