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Concept explainers
Stock Market Gyrations Following is a sample of the day-by-day change, rounded to the nearest 100 points, in the Dow Jones Industrial Average during 10 successive business days around the start of the financial crisis in October 2008:43
–100, 400, –200, –500, 200, –300, –200, 900, –100, 200
a. Compute the mean and standard deviation of the given sample. (Round your answers to the nearest whole number.)
b. Assuming that the distribution of day-by-day changes of the Dow during financial crises is symmetric and bell shaped, then the Dow rises by more than ___ points 2.5% of the time. What is the percentage of times in the sample that the Dow actually rose by more than that amount? [hinT: See Example 2(b).]
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Chapter 8 Solutions
Bundle: Finite Mathematics, Loose-leaf Version, 7th + WebAssign Printed Access Card for Waner/Costenoble's Finite Mathematics, 7th Edition, Single-Term
- Glencoe Algebra 1, Student Edition, 9780079039897...AlgebraISBN:9780079039897Author:CarterPublisher:McGraw HillBig Ideas Math A Bridge To Success Algebra 1: Stu...AlgebraISBN:9781680331141Author:HOUGHTON MIFFLIN HARCOURTPublisher:Houghton Mifflin Harcourt
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