Reference no: EM13100631
1. You attempt a 50 item (n = 50) true-and-false exam. You did not study for the material and your attempt to answer any item is a guess, with a 50% chance that you will get any item correct. You need a score of 30 or better to pass the exam.
A. If you are truly guessing your way through the exam, what is the probability that you will answer any item incorrect?
B. What is the average number of items you can expect to guess correctly?
C. What is the probability you will pass the exam by merely guessing on each item?
D. What is the probability you will get a C, i.e., the probability you will get 35 or more correct?
2. Assume that the average adult height in North America for anyone over the age of 18 is 68 inches, with a standard deviation of 3.50 inches.
A. What is the probability that someone selected randomly from the adult population in North America is less than 64 inches tall?
B. What is the probability that someone selected randomly from the adult population in North America is more than 71 inches tall?
C. What is the probability that someone selected randomly from the adult population in North American is more than 64 inches tall but less that 71 inches tall?
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Estimating the probability that a person comes to store
: John runs a computer software store. He counted 130 people who walked by his store in a day, 59 of whom came into the store. Of the 59, only 24 bought something in the store.
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How much does the internal energy change
: A fluid in an insulated, flexible bottle is heated by a high resistance wire and expands. If 9kJ of heat is applied to the system and it does 5kJ of work, how much does the internal energy change?
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Probabilities regarding house sales
: A nationwide real estate company claims that its average time to sell a home is 57 days. Suppose it is known that the standard deviation of selling times is 12.3 days and that selling times are normally distributed.
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Determine criterion of expected monetary value
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Information regarding normal approximation to binomial
: You attempt a 50 item (n = 50) true-and-false exam. You did not study for the material and your attempt to answer any item is a guess, with a 50% chance that you will get any item correct. You need a score of 30 or better to pass the exam.
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At what speed is the internal energy of the system changing
: A perfectly insulated system has work done by it at a rate of 13 W. At what rate is the internal energy of the system changing?
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Compute the expected value of perfect information
: The local operations manager for the IRS must decide whether to hire 1, 2, or 3 temporary workers. He estimates that net revenues will vary with how well taxpayers comply with the new tax code.
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At what rate is the internal energy of the system changing
: A system has a heat source supplying heat at a rate of 187 W and is doing work at a rate of 130.899998 W. At what rate is the internal energy of the system changing.
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Determine the upper control limit for an r chart
: Twenty samples of subgroup size 3 (n=3) were collected for a variable measurement. Determine the upper control limit (UCL) for an R-chart.
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