Question

Suppose you have data that shows that 12% of athletes test positive for steroids. You also know that 11% of athletes test positive for steroids and actually use steroids. What is the probability that an athlete uses steroids, given that he tests positive?
0.37
0.43
0.51
0.67
0.92

Answer 1

@HazelLuv99

Answer 2

srry but i rlly can't help u i'm bad at math

Answer 3

@Holly00d1248 PLEASE HELPPPPPPP

Answer 4

lol u dont have to try so hard to help mee

Answer 5

would you like help with this

Answer 6

yeah

Answer 7

No @perl he doesnt want help he just wants you to look at it

Answer 8

lets label the probabilities

Answer 9

P( test positive ) = .12
P ( use steroids& test positve ) = .11
P ( use steroids | test positive) = P ( use steroids & test positive ) / P( test positive)

Answer 10

yes

Answer 11

we are using the formula
$$ \Large P( A| B ) = \frac{ P( A \& B ) }{P(B)} $$

Answer 12

can you solve it now?

Answer 13

ya i dont get it

Answer 14

im about to guess on this i need to get it dun

Answer 15

$$\Large \rm {P( use ~steroids | test~ positive)\\~\\ = \frac{ P( use ~steroids ~\&~ test~ positive ) }{P(test~ positive)} = \frac{.11}{.12}
}
$$

Answer 16

.9166?

Answer 17

you can round that

Answer 18

thx for ur help got answer off goooooooooggggle

Answer 19

can i see the google link

Answer 20

can u help me with another question before i leave and yes openstudy.com/updates/51f93db8e4b06e6a116ea63c

Answer 21

ok

Answer 22

openstudy.com/updates/51f93db8e4b06e6a116ea63c

Answer 23

google can give you the wrong answer, i wouldn't use google

Answer 24

ohh

Answer 25

http://prntscr.com/756jy6

Answer 26

what did your google link answer you?