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math80.sample quiz8

# math80.sample quiz8 - 3 Answer Q 3 = 0.6745 5 For Z the...

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wostner : normal distribution : exercises ©2007-2009 ulf wostner <[email protected]> z = ( x - μ ) ⁄ σ x = μ + z σ For each exercise, graph the normal curve, clearly label the axes, and shade the region. Z = Normal(0, 1) 1. For Z, the standard normal distribution, find P(z < 1.73). Answer: 0.9582 ≈ 96% 2. For Z, the standard normal distribution, find P(1.23 < z < 1.73). Answer: 0.0675 ≈ 7% 3. For Z, the standard normal distribution, find P(-1.56 < z < 1.73). Answer: 0.8988 ≈ 90% 4. For Z, the standard normal distribution, find Q
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Unformatted text preview: 3 . Answer: Q 3 = 0.6745 5. For Z, the standard normal distribution, find P 95 . Answer: P 95 = 1.645 X = Normal(140, 30) [lbs] 1. P(X < 175 ) = … Answer: 0.8783 ≈ 88% 2. P(X < 120 ) = … Answer: 0.2525 ≈ 25% 3. P(X > 120 ) = … Answer: 0.7475 ≈ 75% 4. P(130 < X < 150 ) = … Answer: 0.2611 ≈ 26% 5. Which percentile is X = 175 lbs? Answer: P 88 6. Find P 99 . Answer: P 99 = 209.78 [lbs] 7. Find P 10 . Answer: P 10 = 101.54 [lbs] 8. IQR = … Answer: IQR = 40.47 [lbs]...
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