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ICSE Class X Math 2016 Paper

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The histogram below represents the scores obtained by 25 students in a Mathematics mental test. Use the data to :
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Question : 48 of 57
Marks: +1, -0
To calculate mean.
Solution:  
 C.I  f  x  f.x
 0-10  2  5  10
 10-20  5  15  75
 20-30  8  25  200
 30-40  4  35  140
 40-50  6  45  270
   Î£f=25    Î£f.x=695
Mean =  ΣfxΣf=  69525=27.8=\;\frac{\Sigma f x}{\Sigma f}=\;\frac{695}{25}=27.8
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