# hw08 - STAT 225 Homework 8 Due Friday October 29 Comments 1...

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STAT 225 - Homework 8 Due Friday October 29 Comments: 1. This homework is due Friday, October 29 in class, BEFORE class starts. 2. Please remember staple if you turn in more than one page. 3. You must always show all work. If you do not show your work, you may not receive full credit. Do the following problems. 1. Page 190, problem 4.91 + (c) Given that during the afternoon on a randomly selected day the demand has exceeded 150 cfs, what is the probability that it exceeds 300 cfs? (d) What is the probability that in at least two of 12 randomly selected days, the water demand will exceed 200 cfs? Guidance: Think Binomial, where each day is a trial, and define success as “demand exceeds 200”. 2. Page 191, problem 4.96 (a)-(c) DO NOT integrate! Identify the distribution 3. Let X exp ( β ). (a) Find the median of the distribution. Recall: The median of a distribution of a continuous random variable X (denoted by m ) is the value such that half the area under the density function is to the left of it and half the area is to the right. In other words, m

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