Answer
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a. P( z < -2.34) = 0.0096
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b.P(.67 \le z \le 2.02) = P(z <2.02) - P(z<0.67) = 0.9783 - 0.7486 = 0.2297
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c. P( -2.07 \le z \le -.93) = z \le -.93) -P( z \le -2.07) = 0.1762-0.0192= 0.157
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d. P(z < 1.78) = 0.9625
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Work Step by Step
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