In calculating the mean of grouped data, grouped in classes of equal width, we may use the formula x̄ = a + Σfᵢdᵢ/Σfᵢ where a is the assumed mean. a must be one of the mid-points of the classes. Is the last statement correct? Justify your answer.

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TextMean of Grouped Data Using Assumed Mean Method

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TextMean of Grouped Data Using Direct MethodMean of Grouped Data Using Assumed Mean Method