An article in Proceeding of the 33rd International ACM SIGIR Conference on Research and Development in Information

Question:

An article in Proceeding of the 33rd International ACM SIGIR Conference on Research and Development in Information Retrieval ["Understanding Web Browsing Behaviors Through Weibull Analysis of Dwell Time" (2010, p.379-386)]proposed that a Webull can be used to model Web page dwell time (the length of time a We visitor spends on a Web page). For a specific Web page, the shape and scale parameters are 1 and 300 seconds, respectively. Determine the following:
(a) Mean and variance of dwell time.
(b) Probability that a Web user spends more than four minutes on this Web page.
(c) Dwell time exceeded with probability 0.25.
Distribution
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