The following table given the information of frequency distribution of weekly wages of 150 workers of a company . Find the mean of the weekly wages by 'step deviation' method .

Answer

The mean of weekly wages is Rs. `3070`.

Explanation

Here, we take ` A = 2500, g = 1000`

Here, `Sigmaf_(i) u_(i) = 85, Sigma f_(i) = 150, g = 1000`
`baru = (Sigmaf_(i)u_(i))/(Sigmaf_(i)) = (85)/(150) approx 0.57`
Mean `barX = A + baru g`
` = 2500 + 0.57 xx 1000`
` = 2500 + 570`
` = 3070`.