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Days to Maturity. The first two columns of the following table provide a frequency distribution, using limit grouping, for the days to maturity of 40 short-term investments, as found in BARRON’S. The third column shows the class marks.
Days to maturity | Frequency f | Class mark x |
30–39 | 3 | 34.5 |
40–49 | 1 | 44.5 |
50–59 | 8 | 54.5 |
60–69 | 10 | 64.5 |
70–79 | 7 | 74.5 |
80–89 | 7 | 84.5 |
90–99 | 4 | 94.5 |
- a. Use the grouped-data formulas to estimate the sample
mean and sample standard deviation of the days-to-maturity data. Round your final answers to one decimal place. - b. The following table gives the raw days-to-maturity data.
Using Definitions 3.4 and 3.6 on pages 99 and 108, respectively, gives the true sample mean and sample standard deviation of the days-to-maturity data as 68.3 and 16.7, respectively, rounded to one decimal place. Compare these actual values of
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Chapter 3 Solutions
Introductory Statistics, Books a la Carte Plus NEW MyLab Statistics with Pearson eText -- Access Card Package (10th Edition)
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