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Find the arithmetic mean by (a) assumed ...

Find the arithmetic mean by (a) assumed mean and (b) step deviation mthods.

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(a) By assumed mean method
`barx=barxd+(sumfd)/(N)`
`=250+(1000)/(145)=250+6.90`
`=Rs. 256.90`
(b) By step deviation method
`barx=barxd+(sumfd')/(N)xxi=250+((10)/(145)xx100)`
`=250+(1000)/(145)=250+6.90`
`=Rs. 256.90`
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