0 votes 0 votes Let the random variable $X$ represent the number of times a fair coin needs to be tossed till two consecutive heads appear for the first time. The expectation of $X$ is _______. Probability and Statistics gate2015-ec-2 numerical-answers probability-and-statistics probability random-variable expectation + – Milicevic3306 asked Mar 27, 2018 • retagged Mar 3, 2021 by Lakshman Bhaiya Milicevic3306 16.0k points 100 views answer comment Share Follow See all 0 reply Please log in or register to add a comment.