upteto17 q129
- Option : C
- Explanation : (C) Given, number of observation in a survey is 40.
Sum of first 10 observation = 10 × 4.5 = 45
and sum of remain 30 observation = 3.5 × 30 = 105
Sum of 40 observation = 105 + 45 = 150
∴ Mean of 40 observation = 150/40 = 3.75
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