+0  
 
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avatar+2291 

Tried solving this, only got halfway (probably wrong tbh)

RainbowPanda  Apr 16, 2018
 #1
avatar+7339 
+3

num of females + num of males  =  100

num of females + 3(num of females)   =   100

4(num of females)  =   100

 

num of females  =  25

 

num of ppl who chose ping-pong  =  20

 

num of females who chose ping pong  =  60% of 20  =  12

 

num of females who didn't choose ping-pong  =  25 - 12  =  13

 

probability that a person is female  =  num of females / num of ppl

probability that a person is female  =  25 / 100

probability that a person is female  =  0.25

 

probability that a person chose ping-pong  =  num of ppl who chose ping-pong / num of ppl

probability that a person chose ping-pong  =  20 / 100

probability that a person chose ping-pong  =  0.2

 

probability that a person is a female and chose ping pong  =  \(\frac{\text{num of females who chose ping-pong}}{\text{num of females}}\)

probability that a person is a female and chose ping pong  =  12 / 100

probability that a person is a female and chose ping pong  =  0.12

 

probability that a person is female or chose ping-pong  =  (20 + 13) / 100

probability that a person is female or chose ping pong  =  33 / 100

probability that a person is female or chose ping pong  =  0.33

hectictar  Apr 16, 2018
 #2
avatar+2291 
+3

Tysm :)

RainbowPanda  Apr 16, 2018

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