0 votes 0 votes There are two data sets,each of size 5. The variances of those sets are 4 and 5; means are 2 and 4 respectively. If the sets are combined, what would be variance of combined data? (A) 10/11 (B) 11/13 (C) 11/2 (D) 13/11 Probability variance + – ankitgupta.1729 asked Dec 12, 2017 ankitgupta.1729 634 views answer comment Share Follow See all 2 Comments See all 2 2 Comments reply joshi_nitish commented Dec 13, 2017 reply Follow Share is it $\frac{11}{2}$ , though i think i solved it correctly, cross check once. 1 votes 1 votes ankitgupta.1729 commented Dec 13, 2017 reply Follow Share @Nitish, Very well explained :).. Thank you very much :) :).. 0 votes 0 votes Please log in or register to add a comment.
Best answer 1 votes 1 votes You can use these formulas as well. https://www.emathzone.com/tutorials/basic-statistics/combined-variance.html Arpit Dhuriya answered Dec 20, 2017 • selected May 17, 2018 by ankitgupta.1729 Arpit Dhuriya comment Share Follow See 1 comment See all 1 1 comment reply ankitgupta.1729 commented Dec 20, 2017 reply Follow Share Thank you.. 0 votes 0 votes Please log in or register to add a comment.