Pls answer fast

Q7. Draw a histogram and frequency polygon for the following data :
       
C.I 0-50 50-100 100-150 150-200 200-250 250-300
 Frequency    12 18     27    20     17      6

(i) Which mathematical concept is used in the above problem ?

(ii) What is its value ?

Hi, 
First lets draw histogram, 


Now

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asad sdasdf
 
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What are you looking for?