Calculate Mean Deviation about Median Class $5$ $15$ $25$ $35$ $45$ Frequency $5$ $10$ $20$ $5$ $10$

The total frequency is 40, placing the median at the 20th value, which corresponds to the class 15. The mean deviation about the median is calculated by summing frequency times absolute deviation and dividing by total frequency. This yields 360 divided by 40, resulting in 9.

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