MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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The variance of a sample of 99 observations equals 81. The standard deviation of the sample equals?
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- The amount of Jen's monthly phone bill is Normally distributed with a mean of $ 76 and a standard deviation of $ 11.What percentage of her phone bills are less than $ 80?arrow_forward1.2, 2.7, 5.3, 3.4, 4.1,4.6, 3.3, 2.6. Find the standard deviationarrow_forward3) Explain why we need to square the deviations from the mean in our calculation of the standard deviationarrow_forward
- Explain what would happen if Person A scored lower than the mean of 70. Give an example exam score for that and calculate how many standard deviations Person A is above or below the meanarrow_forwardThe ages in years of a random sample of shoppers at a gamming store are shown. 12, 17, 23, 13, 20, 16, 20, 18, 13, 18. Find the range, mean, variance and standard deviation.arrow_forwardIn a survey, 80% of the voters support a particular referendum. If 30 voters are chosen, find the standard deviation of the number of voters who support the referendum.arrow_forward
- State two ways the standard deviation differs from the average deviation.arrow_forwardThe mean age of clients at a local nail salon is 33.9 years. If 7.21% of the clients are older than 38, find the standard deviation.arrow_forwardScores on a recent NYS Standardized Exam were normally distributed with a mean of 77.6 and a standard deviation of 4.3. Find the NYS Standardized Exam score that separates the bottom 2.5% from the rest. Round this score to the nearest tentharrow_forward
- After calculating the mean and standard deviation, how do we interpret the result, and when a variable look strange?arrow_forwardTrue or false. If the standard deviation of a dataset is 0, the mean must also be 0.arrow_forwardWhat does the standard deviation tell you about a set of data?arrow_forward
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