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Find the mean for the following data : ...

Find the mean for the following data :
`{:("C.I",0-10,10-20,20-30,30-40,40-50,),("f"," 3"," 5"," 3"," 9"," 5",):}`

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The correct Answer is:
Mean `=28.2`
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CPC CAMBRIDGE PUBLICATION-MOST LIKELY QUESTION PAPER 10 -QUESTIONS
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