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**Unformatted text preview: **to 0.9599 Therefore 95.99% of the workers are less than 57 years old. X =57 μ = σ = 50 4 z = 1.75 …P(z ≤ 1.75) = 0.9599 2.3 – Normal Probability Distribution 4 c) What is the probability that any one worker is 46 years old or older? X =46 μ = σ = 50 4 z = = -1.00 σ μ X Z 4 50 46 1.00 ? P(Z ≤ -1.00)= P(Z > -1.00)= = 0.8413 1 – 0.1587 0.1587 d) 10% of the workers are above what age? X = μ = σ = 50 4 z = = 1.28 ? ? σ μ X z 4 5 X 28 1 . 50 .28) 1 4( X years 5.12 5 2.3 – Normal Probability Distribution 5 Function for EXCEL: NORMDIST Use when you need to find probability x μ σ TRUE Function for EXCEL: NORMINV Use when you need to find x μ σ % between 0 & x 2.3 – Normal Probability Distribution 6 LAB QUESTIONS: Lab 5 # 1, 2 TEXT QUESTIONS: Pg 198 # 1, 2, 3, 4, 5...

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