1. Chapter 4
Mathematical Expectation

2. Definition 4.1
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3. Theorem 4.1
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4. Definition 4.2
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5. Section 4.2
Variance and Covariance of Random Variables

6. Figure 4.1 Distributions with equal means and unequal dispersions
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7. Definition 4.3
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8. Theorem 4.2
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9. Theorem 4.3
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10. Definition 4.4
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11. Theorem 4.4
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12. Definition 4.5
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13. Section 4.3
Means and Variances of Linear Combinations of Random Variables

14. Theorem 4.5
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15. Corollary 4.1
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16. Corollary 4.2
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17. Theorem 4.6
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18. Theorem 4.7
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19. Corollary 4.3
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20. Corollary 4.4
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21. Theorem 4.8
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22. Corollary 4.5
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23. Theorem 4.9
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24. Corollary 4.6
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25. Corollary 4.7
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26. Corollary 4.8
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27. Corollary 4.9
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28. Corollary 4.10
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29. Corollary 4.11
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