STATS:DATA+MODELS-MY LAB ACC >CUSTOM<
21st Edition
ISBN: 9780137643127
Author: DeVeaux
Publisher: PEARSON
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Chapter 12, Problem 2E
To determine
Explain the meaning of random in the given context.
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Solve for X. Explain each step.
2^2x • 2^-4=8
One hundred people were surveyed, and one question pertained to their educational background. The results of this question and their genders are given in the following table.
Female (F)
Male (F′)
Total
College degree (D)
30
20
50
No college degree (D′)
30
20
50
Total
60
40
100
If a person is selected at random from those surveyed, find the probability of each of the following events.1. The person is female or has a college degree. Answer:
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2. The person is male or does not have a college degree. Answer:
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3. The person is female or does not have a college degree.
need help with part b
Chapter 12 Solutions
STATS:DATA+MODELS-MY LAB ACC >CUSTOM<
Ch. 12.1 - JUST CHECKING
1. One common proposal for beating...Ch. 12.3 - Prob. 2JCCh. 12 - Prob. 1ECh. 12 - Prob. 2ECh. 12 - Prob. 3ECh. 12 - Prob. 4ECh. 12 - 5. Wardrobe In your dresser are five blue shirts,...Ch. 12 - 6. Playlists Your list of favorite songs contains...Ch. 12 - Prob. 7ECh. 12 - Cell phones and surveys II The survey by the...
Ch. 12 - Prob. 9ECh. 12 - 24. Sample spaces II For each of the following,...Ch. 12 - Prob. 11ECh. 12 - Prob. 12ECh. 12 - Prob. 13ECh. 12 - 28. Snow After an unusually dry autumn, a radio...Ch. 12 - Prob. 15ECh. 12 - Prob. 16ECh. 12 - 29. Auto insurance Insurance companies collect...Ch. 12 - Prob. 18ECh. 12 - Prob. 19ECh. 12 - Prob. 20ECh. 12 - Prob. 21ECh. 12 - 34. Homes Funding for many schools comes from...Ch. 12 - Prob. 23ECh. 12 - 36. Lefties Although it’s hard to be definitive in...Ch. 12 - Prob. 25ECh. 12 - Prob. 26ECh. 12 - Prob. 27ECh. 12 - 40. Stats projects In a large Introductory...Ch. 12 - More repairs Consider again the auto repair rates...Ch. 12 - Prob. 30ECh. 12 - Repairs again You used the Multiplication Rule to...Ch. 12 - Prob. 32ECh. 12 - Prob. 33ECh. 12 - Prob. 34ECh. 12 - More energy Exercise 33 shows the results of a...Ch. 12 - Prob. 36ECh. 12 - Prob. 37ECh. 12 - 46. Polling, part II According to Pew Research,...Ch. 12 - Prob. 39ECh. 12 - 48. Blood The American Red Cross says that about...Ch. 12 - Prob. 41ECh. 12 - Prob. 42ECh. 12 - Prob. 43ECh. 12 - Slot machine A slot machine has three wheels that...Ch. 12 - Prob. 45ECh. 12 - 52. The train To get to work, a commuter must...Ch. 12 - Prob. 47ECh. 12 - Religion Census reports for a city indicate that...Ch. 12 - Prob. 49ECh. 12 - 54. Pepsi For a sales promotion, the manufacturer...Ch. 12 - Prob. 51ECh. 12 - Prob. 52E
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- Suppose you know that Bob's test score is above the mean, but he doesn't remember by how much. At least how many students must score lower than Bob?arrow_forwardIf a baby's weight is at the median, what's her percentile?arrow_forwardAt the same restaurant as in Question 19 with the same normal distribution, what's the chance of it taking no more than 15 minutes to get service?arrow_forward
- Clint, obviously not in college, sleeps an average of 8 hours per night with a standard deviation of 15 minutes. What's the chance of him sleeping between 7.5 and 8.5 hours on any given night? 0-(7-0) 200 91109s and doiw $20 (8-0) mol 8520 slang $199 galbrog seam side pide & D (newid se od poyesvig as PELEO PER AFTE editiw noudab temand van Czarrow_forwardTimes to complete a statistics exam have a normal distribution with a mean of 40 minutes and standard deviation of 6 minutes. Deshawn's time comes in at the 90th percentile. What percentage of the students are still working on their exams when Deshawn leaves?arrow_forwardSuppose that the weights of cereal boxes have a normal distribution with a mean of 20 ounces and standard deviation of half an ounce. A box that has a standard score of o weighs how much? syed by ilog ni 21arrow_forward
- Bob scores 80 on both his math exam (which has a mean of 70 and standard deviation of 10) and his English exam (which has a mean of 85 and standard deviation of 5). Find and interpret Bob's Z-scores on both exams to let him know which exam (if either) he did bet- ter on. Don't, however, let his parents know; let them think he's just as good at both subjects. algas 70) sering digarrow_forwardSue's math class exam has a mean of 70 with a standard deviation of 5. Her standard score is-2. What's her original exam score?arrow_forwardClint sleeps an average of 8 hours per night with a standard deviation of 15 minutes. What's the chance he will sleep less than 7.5 hours tonight? nut bow visarrow_forward
- Suppose that your score on an exam is directly at the mean. What's your standard score?arrow_forwardOne state's annual rainfall has a normal dis- tribution with a mean of 100 inches and standard deviation of 25 inches. Suppose that corn grows best when the annual rainfall is between 100 and 150 inches. What's the chance of achieving this amount of rainfall? wved now of sociarrow_forward13 Suppose that your exam score has a standard score of 0.90. Does this mean that 90 percent of the other exam scores are lower than yours?arrow_forward
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