Advanced Engineering Mathematics
10th Edition
ISBN: 9780470458365
Author: Erwin Kreyszig
Publisher: Wiley, John & Sons, Incorporated
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I need help finding standard deviation.
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- I don't understand how to use the given information to answer the questions about the mean and standard deviation. Can you explain?arrow_forwardThe results of a common standardized test used in psychology research is designed so that the population mean is 115 and the standard deviation is 30. A subject earns a score of 199. What is the z-score for this raw score?arrow_forwardJennifer needs to estimate the average age of vets in Houston. The standard deviation of ages is 17 years. She wants the standard error of her mean to be 0.3 years. How many vets is she going to need to sample to get at least that kind of accuracy?(be sure to round up)arrow_forward
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- Jared has a mean of 74 on his quizzes, with a standard deviation of 7. On his most recent quiz, he scored a 65. Is this unusual compared to how he usually performs on quizzes?arrow_forwardAn exam score has a mean of 504 and standard deviation of 90. What exam score coresponds to a Z-score of 1.60?arrow_forwardPlease help me understand the problem. Is the given standard deviations 6, and 7? I know I need to use the unit normal table, and shade the curve. But how? Thanks.arrow_forward
- How does a nonzero constant number c change a standard deviation problem?arrow_forwardThe average age of Amtrak passenger train cars is about 20 years. If the distribution of ages is normal and 10% of the cars are older than 24 years, find the the standard deviation.arrow_forwardA person in the U.S. eats about 25 pounds of M&M's per year with a standard deviation of 3 pounds. How many M&M's would I have to eat to be in the top 20%?arrow_forward
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