practice_prel2_f08

practice_prel2_f08 - Engineering Statistics ENGRD270...

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Unformatted text preview: Engineering Statistics ENGRD270 Practice Problems for Prelim No.2 Fall 2008 Appropriate statistical tables (from the text book) will be provided to answer the questions. 1. Suppose that the amount of water (in grams) produced in a particular chemical reaction can be modeled by a random variable X having probability density function given by f ( x ) = ( 1 2 x, ≤ x ≤ 2 , else (a) What is the probability that more than 1 gram of water is produced? (b) What is the conditional probability that more than 1 gram of water is produced, given that at least 0.5 grams is produced? (c) What is the value of c such that 90% of all reactions of this type will produce more than c grams of water? (d) What is the standard deviation of the amount of water produced? 2. [Know your Chloresterol level.] According to the Framingham study, the blood chloresterol level of U.S. adults is approximately normally distributed with mean 213 mg/dl and standard deviation 44.8 mg/dl....
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This note was uploaded on 12/19/2008 for the course ENGRD 2700 taught by Professor Staff during the Fall '05 term at Cornell.

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practice_prel2_f08 - Engineering Statistics ENGRD270...

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