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Sticky Note
The mean of 5 observation is 60, the mean of 10 observation is 30 and the mean of 15 observations is 20. The mean of all 30 observations is:
5 مشاہدات کا اوسط 60 ہے، 10 مشاہدات کا اوسط 30 ہے اور 15 مشاہدات کا اوسط 20 ہے۔ تمام 30 مشاہدات کا اوسط ہے
  1. 20
  2. 10
  3. 15
  4. 30
  5. 25
Explanation

= (5x60)+(10x30)+(15x20) / 30

= 30

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