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2015-03-03T03:54:44+05:30

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Sum of observation = 640p +2800
no. of observation = 12p +60

mean=sum of observation / no. of observation
     50  = 640p + 2800 / 12p +60
    600p + 3000 = 640p + 2800
  3000 - 2800 = 640p - 600p
  200 = 20p
10 = p
2 5 2
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