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2014-12-28T11:11:04+05:30

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See the image  which is in the box 
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2014-12-28T11:20:41+05:30

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Observations are 8,6,7,p,9
no of observations are 5
 mean =sum of observations/ no of observations
          ⇒8+6+7+p+9/5=7
           ⇒30+p/5  =7               
           ⇒30+p=7x5
            ⇒30+p=35
            ⇒p=35-30
              ⇒p=5 
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