Question

what is step deviation method​

Answer 1

Step Deviation Method (Mean)

Step Deviation : Sometimes, during the application of the short-cut method for finding the mean, the deviation d, are divisible by a common number 'h'.

Formula for step deviation method = A + ∑fiui÷ ∑fi × h. Where : A = assume mean. ui = ∑ = total frequency.

Answer 2

Step-by-step explanation:

the method which reduces calculation.

first we have to find values of di as di = xi( class mark) - A (assumed mean ) and write in the column.

If we can find gi i.e. the G.C.D. of all di easily we create a column for all ui where ui = di/ hi .

Find the mean u bar of all ui

using the formula X bar = A + u bar × g.