6.71 It has been found the retirement age of a community follows a normal distribution with a...

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6.71 It has been found the retirement age of a community follows a normal distribution with a mean of 75 years and a standard deviation of 3 years. A random sample of 11 people from the community is taken.

a. What is the probability that the sample mean retirement age taken is more than 77 years?

b. The probability is 0.18 that the sample mean retirement age taken is less than how many?

c. The probability is 0.05 that the sample standard deviation of retirement age taken is less than how many?

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Essential Mathematics And Statistics For Science

ISBN: 9780470694480

2nd Edition

Authors: Graham Currell, Dr. Antony Dowman

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Question Posted: Sep 21, 2024 02:02 PM

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6.71 It has been found the retirement age of a community follows a normal distribution with a...

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