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Calculate the aritmetic mean by (a) ass...

Calculate the aritmetic mean by (a) assumed mean and (b) step deviation methods

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(a) By assumd mean method
`barx=barxd+(sumfd)/(N)=50+(100)/(80)=51.25 ` marks.
(b) By step deviation method
`barx=barxd+(sumfd')/(N)xxi=50+(5)/(80)xx20=50+(100)/(80)xx20=50+(100)/(80)=50+1.25=51.25 ` marks.
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