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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 assumed mean method
`barx=barxd+(sumfd)/(N)=10+(-180)/(500)`
`=10-1.44=8.56` years.
(b) By step deviation method.
`barx=barxd+(sumfd')/(N)xxi`
`=10+(-180)/(500)xx4=10+(-0.36xx4)`
`=10-1.44=8.56` Years.
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