Chapter 6 - Section 6.4 - Determining the z and x Values When an Area Under the Normal Distribution Curve Is Known - Exercises - Page 256: 6.38

a. $1-P(z\lt Z)$ = .020 $P(z\lt Z)$ = 1-.0250 = 0.975 From Table IV of Appendix B, Z=1.97 b. $P(z\lt Z) = 0.0500$ From Table IV of Appendix B, Z = -1.645 c. $P(z\lt Z) = 0.001$ From Table IV of Appendix B, Z = -3.08 d. $1-P(z\lt Z)$ = .0100 P($z\lt Z$) = 1-.0100 = 0.99 From Table IV of Appendix B, Z=2.33

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