Mathematics
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Statistics
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Question
Methods to find mean of grouped data?
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Answer
1. Direct: x̄=Σfᵢxᵢ/Σfᵢ 2. Assumed mean: x̄=A+Σfᵢdᵢ/Σfᵢ (d=x−A) 3. Step deviation: x̄=A+(Σfᵢuᵢ/Σfᵢ)×h