LinMT2Practice

# LinMT2Practice - MATH 218 | Fall 2008 Joy's Practice...

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MATH 218 | Fall 2008 Joy’s Practice Midterm # 2 SI Leader: Joy Chen Professor Lin Questions about this exam? Tuesday, November 4, 2008 from 3pm-5pm in MHP B7B This midterm was designed to be longer than your real one. In order to simulate the environment of your real exam, allow yourself approximately 8 minutes per question, for a total of 64 minutes. You should be able to complete this exam within 70 minutes.

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2. 1. The amount of time it takes for a computer to perform a system backup (in hours) has the following distribution: (2/5)x 0≤x<1 f(x) = 2/5 1≤x≤3 0 x<0, x>3 a. Find the probability that a randomly selected computer isn't finished performing a system backup after an hour and twenty minutes. b. Find the average amount of time it takes for a computer to perform a backup. c. Sony has come up with a systems upgrade package that is being distributed to the slowest 20% of computers when performing a backup. How slow must a computer be running in order to receive this upgrade? d. John's computer has been working on a systems backup for 45 minutes already. What's the probability that it'll take at least another half hour to finish? e. At a local computer store, a CompuNerd staff member performs system backups one after another without breaks. On Monday, there are 40 computers waiting for system backups. What should this CompuNerd staff member say he will finish in order to have a 93% chance of being correct?
3. 2. The amount of time that a business person spends monitoring their email per day (checking and responding) is uniformly distributed between 1 hour and 7.5 hours. a. What is the probability that a business person spends exactly 2 hours and 30 minutes checking their email?

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LinMT2Practice - MATH 218 | Fall 2008 Joy's Practice...

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