MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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Would you prefer a standard deviation of s=2 or s=8?
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- The scores on a college entrance test have an approximately normal distribution with mean, µ = 84 points and a standard deviation, σ = 5 points. About 68% of the x values lie between what two values?arrow_forwardThe distribution of blood cholesterol level in the population of young men aged 20 to 34 years is close to Normal with standard deviation ? = 45 milligrams per deciliter (mg/dL). You measure the blood cholesterol of 13 cross-country runners. The mean level is x = 174 mg/dL. Assume that ? is the same as in the general population. How large a sample is needed to cut the margin-of-error in half for a 90% confidence interval of the mean level ? among the cross-country runners?arrow_forwardThe mean score for first exam in your first organic chemistry class (section A) was 60, with a standard deviation of 5. Your score on the exam was 70. A. How many standard deviations above the mean is your score?arrow_forward
- On a recent quiz, the class mean was 69 with a standard deviation of 3.5. Calculate the z-score (to 4 decimal places) for a person who received score of 59. Z-score:arrow_forwardA distribution of values is normal with a mean of 246.2 and a standard deviation of 99.5. Find P78, which is the score separating the bottom 78% from the top 22%. P78 Enter your answer as a number accurate to 4 decimal places.arrow_forwardA population of score has μ = 44. in this population, a score of X = 40 corresponds to z = -0.50. What is the population standard deviation?arrow_forward
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