# CBSE Class 10 Answered

**What is the principle behind step deviation and assumed mean method? What are we actually finding di here?pls. explain the concept?**

Asked by Tanmay k | 13 Jul, 2012, 05:11: PM

Expert Answer

Answer : In the step deviation method , we minimise our problem by assumed mean method where in we consider the mean of the given variables x

_{i}whose frequencies are given. i.e one of the variable is assumed as a assumed mean denoted by A .After that a table is formed using the formula d

_{i}= x_{i}- Athen another table is formed using formula u

_{i}= (x_{i}- A) / h , here h is the interval size.this reduces the problem , where we then form a table of f

_{i}u_{i}, here f_{i }is the class interval.obtaining the values, we put them in the following formula to find the mean :

mean = A + [ (h /N) * summation f

_{i}u_{i }]
Answered by | 15 Jul, 2012, 01:55: AM

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