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4. Example Problem IV - Step deviation method

Find mean by Step deviation method.

Class interval	\(10-25\)	\(25-40\)	\(40-55\)	\(55-70\)	\(70-85\)	\(85-100\)
Number of students	\(2\)	\(3\)	\(7\)	\(6\)	\(6\)	\(6\)

Mean \(=\)

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