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[DOC File]Normal Curve Percentages
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In fact, for any number (or fraction) of standard deviations, we know exactly what percent of the data fall within that number of standard deviations of the mean. For example, consider the normal curve percentages in the table below. Given a number z of standard deviations, the table gives the percent of data values between the mean ( and ((z(.
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[DOC File]Z-Score Practice Worksheet - Long Branch Public Schools
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A score of 90 on a test with a mean of 86 and a standard deviation of 18. A score of 18 on a test with a mean of 15 and a standard deviation of 5. SOLUTIONS. Z-Score Practice Worksheet Name _____ A normal distribution of scores has a standard deviation of 10. Find the z-scores corresponding to each of the following values:
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[DOC File]Standard deviation - 清華大學物理學系
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The standard deviation is the most common measure of statistical dispersion, measuring how widely spread the values in a data set are. If the data points are close to the mean, then the standard deviation is small. As well, if many data points are far from the mean, then the standard deviation is large. ...
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[DOC File]AP Statistics The Standard Normal Curve
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For the data in #1, find the mean and standard deviation using a calculator. Write down the break points for ±1 ±2 and ±3 . Place the data in order and count the number of items in each of the classes. Then, find the percent of the data in each standard deviation …
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[DOC File]PROBABILITY TOPICS: HOMEWORK
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Find the sample mean, . Find the sample standard deviation, s. Construct a histogram of the data. Complete the columns of the chart. Find the first quartile. Find the median. Find the third quartile. Construct a box plot of the data. What percent of the students saw fewer than three movies? Find the 40th percentile. Find the 90th percentile.
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[DOC File]Probability & Statistics
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The mean grade point average of the engineering majors at a large university is 3.23, with a standard deviation of 0.72. In a class of 48 students, find the probability that the mean grade point average of the students is less than 3.15. The average age of accountants is 43 years, with a standard deviation of 5 years.
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[DOC File]Z-Score Practice Worksheet
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For the numbers below, find the percent of cases falling above the z-score: 0.24 41%-2.07 98%. A patient recently diagnosed with Alzheimer’s disease takes a cognitive abilities test and scores a 45. The mean on this test is 52 and the standard deviation is 5. …
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Find percent with standard deviation