+0  
 
+1
37
2
avatar+544 

https://vle.mathswatch.co.uk/images/questions/question3035.png

 

 

winkwinkwink

lynx7  Apr 1, 2018

Best Answer 

 #2
avatar
+2

I think you made a typo in your math: 140+25+60 = 225 students who participate in all

330 - 225 = 105 - students who do not participate.

105 / 330 = 7 / 22 - probability that a randomly picked student is a non-participant.

Guest Apr 1, 2018
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2+0 Answers

 #1
avatar+111 
+3

Ok, 60 do both drama and sports, so 85-60=25 only take drama, and 200-60=140 on do sports. Adding, 140, 25, and 40, we get 205- do everything. But, the question is asking, what is the probability, that a student chosen at random is in neither.  This is just, 330-205=125. So, 125/330*100=37.87

azsun  Apr 1, 2018
 #2
avatar
+2
Best Answer

I think you made a typo in your math: 140+25+60 = 225 students who participate in all

330 - 225 = 105 - students who do not participate.

105 / 330 = 7 / 22 - probability that a randomly picked student is a non-participant.

Guest Apr 1, 2018

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