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The lifespan of people with Alzheimer's disease from the onset of symptoms to the person's death follows an approximately normal distribution with a mean lifespan of 8 years and a standard deviation of 4 years. If a random sample of 225 people who died of Alzheimer's disease is chosen in a medical center, then the probability that the average lifespan of the people in this sample is greater than 8.5 years is: (To the nearest t wo decimal places) A) 0.0320 B) 0.4680 C) 0.9680 D) 0.5022

The lifespan of people with Alzheimer's disease from the onset of symptoms to the person's death follows an approximately normal distribution with a mean lifespan of 8 years and a standard deviation of 4 years. If a random sample of 225 people who died of Alzheimer's disease is chosen in a medical center, then the probability that the average lifespan of the people in this sample is greater than 8.5 years is: (To the nearest t wo decimal places) A) 0.0320 B) 0.4680 C) 0.9680 D) 0.5022

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 19PFA
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The lifespan of people with Alzheimer's disease from the onset of symptoms to the person's death follows an approximately normal distribution with a mean lifespan of 8 years and a standard deviation of 4 years. If a random sample of 225 people who died of Alzheimer's disease is chosen in a medical center, then the probability that the average lifespan of the people in this sample is greater than 8.5 years is: (To the nearest t wo decimal places) A) 0.0320 B) 0.4680 C) 0.9680 D) 0.5022
Transcribed Image Text:The lifespan of people with Alzheimer's disease from the onset of symptoms to the person's death follows an approximately normal distribution with a mean lifespan of 8 years and a standard deviation of 4 years. If a random sample of 225 people who died of Alzheimer's disease is chosen in a medical center, then the probability that the average lifespan of the people in this sample is greater than 8.5 years is: (To the nearest t wo decimal places) A) 0.0320 B) 0.4680 C) 0.9680 D) 0.5022
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