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Calculate arithmetic mean from the follo...

Calculate arithmetic mean from the following data by Short-cut Method:
`{:("Class Interval",20-25,25-30,30-35,35-40,40-45,45-50,50-55),("Frequency"," "10," "12," "8," "20," "11," "4," "5):}`

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The correct Answer is:
Arithmetic Mean = 35.5
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TARUN JAIN & VK OHRI-MEASURES OF CENTRAL TENDENCY - ARITHMETIC MEAN-4. Essential Practicals
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