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Exam1-Questions

# Exam1-Questions - 7200 RPM has an average SEEK rand = 10...

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ECE 460: Computer System Performance Evaluation Spring 2005 Exam 1 Name____________________ This is an OPEN BOOK and OPEN NOTES exam. You have 75 minutes to complete it. If you make any assumptions, state them before you start the problem. 1. (20 points) Given the following data, cluster it into 3 clusters using the MST algorithm. You may use Manhattan distance in your computations. Show your work . DATA: (2, 2), (10, 10), (6, 0), (2, 4), (2, 6), (8, 8), (6, 6)

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2. (10 points) What is the average disk seek time for the following sequence of requests, assuming that SEEK rand = 10 msec? Show our work DATA: 10, 11, 12, 57, 58, 30, 31, 32, 33, 34, 1, 3
3. (30 points) The disk in a server receives requests at a rate of 10 requests per second. Trace results show that 30% are for random blocks, and 70% are for sequences of blocks that average 12 blocks in length. Block size is 2048 bytes. The disk rotates at

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Unformatted text preview: 7200 RPM, has an average SEEK rand = 10 msec, and a date transfer rate of 10MB/sec. Assume that the controller time is 0.1 msec. What is the average service time for the disk? Show our work 4. (20 points) Calculate the expected value, second central moment and standard deviation for the following probability density function. Evaluate for a = 0 and b = 10. Show our work . ⎪ ⎪ ⎩ ⎪ ⎪ ⎨ ⎧ ≤ ≤ − = otherwise b x 1 ) ( a a b x f 5. (10 points). Assume you have the following data. Calculate the z-score values. Show our work . DATA: (1000, 1150), (50, 55), (3300, 2000), 6. (10 points) Assume that you have a pocket full of coins, specifically one penny, one nickel, one dime, one quarter and one dollar. Calculate the expected value, second central moment and standard deviation associated with picking one coin at random from you pocket. Show our work ....
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Exam1-Questions - 7200 RPM has an average SEEK rand = 10...

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