Pulmonary Disease Forced expiratory volume (FEV) is an index of pulmonary function that measures the volume of air expelled after 1 second of constant effort. FEV is influenced by age, sex, and cigarette smoking. Assume that in 45- to 54-year-old nonsmoking men FEV is normally distributed with mean = 4.0 L and standard deviation = 0.5 L. In comparably aged currently smoking men FEV is nor- mally distributed, with mean = 3.5 L and standard deviation = 0.6 L. 5.21 If an FEV of less than 2.5 L is regarded as showing some functional impairment (occasional breathlessness, inability to climb stairs, etc.), then what is the probability that a currently smoking man has functional impairment? 5.22 Answer Problem 5.21 for a nonsmoking man. Some people are not functionally impaired now, but their pulmonary function usually declines with age and they even- tually will be functionally impaired. Assume that the decline in FEV over n years is normally distributed, with mean = 0.03n L and standard deviation = 0.02n L. 5.23 What is the probability that a 45-year-old man with an FEV of 4.0 L will be functionally impaired by age 75?

Pulmonary Disease Forced expiratory volume (FEV) is an index of pulmonary function that measures the volume of air expelled after 1 second of constant effort. FEV is influenced by age, sex, and cigarette smoking. Assume that in 45- to 54-year-old nonsmoking men FEV is normally distributed with mean = 4.0 L and standard deviation = 0.5 L. In comparably aged currently smoking men FEV is nor- mally distributed, with mean = 3.5 L and standard deviation = 0.6 L. 5.21 If an FEV of less than 2.5 L is regarded as showing some functional impairment (occasional breathlessness, inability to climb stairs, etc.), then what is the probability that a currently smoking man has functional impairment? 5.22 Answer Problem 5.21 for a nonsmoking man. Some people are not functionally impaired now, but their pulmonary function usually declines with age and they even- tually will be functionally impaired. Assume that the decline in FEV over n years is normally distributed, with mean = 0.03n L and standard deviation = 0.02n L. 5.23 What is the probability that a 45-year-old man with an FEV of 4.0 L will be functionally impaired by age 75?

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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