Watch the second video session on “Statistics” for Class Xth – concepts and solved questions
Statistics – Class X – Part 2
1. Step-deviation method- Explanation and what is its need?
2. Also things to note that :
a. the step-deviation method will be convenient to apply if all the di’s have a common factor.
b. The mean obtained by all the three methods- Direct method, Assumed Mean Method and Step Deviation Method, is the same.
c. The assumed mean method and step-deviation method are just simplified forms of the direct method.
d. The formula still holds if a and h are not as given above, but are any non-zero numbers satisfying
NCERT Exercise 14.1
Question 1 , 2 explained in details.