histogram labeleing

fuff

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Joined
Apr 12, 2014
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okay i have a final coming up on sunday and i reviewing my old midterm and i dont know how to read this graph, i got the questions wrong so i was hoping someone could help!

image:
dmv5fq.jpg





question 1 which is not a quinitle of the distribution: a)80 b)60 c)20 d)40 i wrote 20 but that was wrong and a wild guess
q2: find the 40th percentile: a)80 b)60 c)50 d)40 e)30 f)none again randomly guessed and got it wrong
q3: find the percentile rank of 40 a)10% b)20% c)30 d)40 e)none / the answer is 30% but i guessed and got it right i dont know how/why thats the answer so please heko!
 
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