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The following table shows marks obtained...

The following table shows marks obtained by the students of a class in their test in English:
`{:("Marks",0-10,10-20,20-30,30-40,40-50),("Number of Students"," "20," "24," "40," "36," "20):}`
Calculate arithmetic mean using Step-deviation method.

Text Solution

Verified by Experts


`(sumfd')/(sumf)=12/140=0.086`
`"Mean, "barX=A+(sumfd')/(sumf)xxC`
`=25+0.086xx10`
`=25+0.86`
`=25.86`
Arithmetic Mean = 25.86 marks.
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TARUN JAIN & VK OHRI-MEASURES OF CENTRAL TENDENCY - ARITHMETIC MEAN-Illustration
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