0 votes 0 votes closed with the note: self resolved. Consider the following probability mass function of a random variable X $p(X,q)=\{q\,\,if\,X=0 \\\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,1-q\,\,\,if\,X=1\\ 0\,\,otherwise$ If q=0.4, the variance of X is.? Probability probability + – Ayush Upadhyaya asked Nov 8, 2018 • closed Nov 8, 2018 by Ayush Upadhyaya Ayush Upadhyaya 1.8k views comment Share Follow See all 5 Comments See all 5 5 Comments reply Show 2 previous comments goxul commented Nov 9, 2018 reply Follow Share @Shubhanshu I just used the formula that $\sigma = E[X^2] - (E[X])^2$ 0 votes 0 votes vikash98 commented Jan 8, 2019 reply Follow Share the answer is 0.56 0 votes 0 votes chauhansunil20th commented Jan 16, 2019 reply Follow Share @Ayush Upadhyaya what is the right answer of this question? i am getting 0.24 as 0.6-0.36=0.24 0 votes 0 votes Please log in or register to add a comment.