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Calculate average of the following discr...

Calculate average of the following discrete series. Use Short-cut Method by taking 25 as assmed average.
`{:("Size",30,29,28,27,26,25,24,23,22,21),("Frequency (f)",2,4,5,3,2,7,1,4,5,7):}`

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The correct Answer is:
Average = 24.925
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TARUN JAIN & VK OHRI-MEASURES OF CENTRAL TENDENCY - ARITHMETIC MEAN-4. Essential Practicals
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  17. In the following frequency distribution, if the arithmetic mean is 45....

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