4. In order to find the mean for grouped data, it is necessary to: a) Find the sum of the frequency multiplied by the class mid-point for each class interval, then divide by the total frequency b) Find the sum of the frequency multiplied by the class upper boundary for each class interval, then divide by the total frequency c) Find the sum of the frequency multiplied by the class lower-boundary for each class interval, then divide by the total frequency d) Find the sum of the frequency multiplied by the class mid-point for each class interval, then divide by sum of the class mid-points.

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