My Math Forum Probability that a user will watch a video

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 October 29th, 2016, 09:46 AM #1 Newbie   Joined: Oct 2016 From: Zambia Posts: 2 Thanks: 0 Probability that a user will watch a video The question goes like this: The viewing rate of a video, i.e. the probability that it is watched by the members of a community when it appears on their news feed is 0.35 A particular user, usr, has a probability 0.85 of watching a video that appears on his news feed. Given the viewing rate of the video and the fact that the video does appear on his news feed, what is the probability that usr will watch the video? Some help, please. I'm very weak in probability.
 October 29th, 2016, 10:02 AM #2 Senior Member     Joined: Sep 2015 From: USA Posts: 2,122 Thanks: 1102 I don't think you have the question correct. I believe the first probability is the that of the video appearing on the news feed at all. Otherwise the first statement has no bearing on the problem. As stated the answer is just that given in the problem. The particular user has a probability of 0.85 watching the video. If you do mean there is a probability of 0.35 that it appears on his news feed, then the probability that this user watches the video is $P[\text{usr watches video}] = P[\text{usr watches video | video appears on news feed}]\cdot P[\text{video appears on newsfeed}] = (0.85)(0.35) = 0.2975$
 October 29th, 2016, 06:51 PM #3 Newbie   Joined: Oct 2016 From: Zambia Posts: 2 Thanks: 0 Edit Sorry about that. My instructor says it is not the viewing rate of the video rather the attractive coefficient of the video. Greater the value of the coefficient higher the probability that it is watched. Now the video does appear on the news feed of usr. usr, has a probability 0.85 of watching a video that has a coefficient of 1. What is the probability he will watch this video? Last edited by microlifecc; October 29th, 2016 at 06:58 PM.

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