# Chapter 5 - Continuous Random Variables - Exercises 5.20 - 5.52 - Learning the Mechanics - Page 241: 5.25e

0.6826

#### Work Step by Step

Using Table-IV, we have: $P(z \leq -1) = 0.8413$ $P(z \geq 1) = 0.1587$P(-1 \leq z \leq 1) = 0.8413 - 0.1587 = 0.6826

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