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