48. Suppose Appendix Table A.3 contained (z) only for z 0. Explain how you could still...

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48. Suppose Appendix Table A.3 contained (z) only for z  0.

Explain how you could still compute

a. P( 1.72  Z  .55)

b. P( 1.72  Z  .55)

Is it necessary to table (z) for z negative? What property of the standard normal curve justifies your answer?

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