A recent survey of Australians found that mean sleep time was 8 hours with a standard deviation

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A recent survey of Australians found that mean sleep time was 8 hours with a standard deviation of 3 hours. Assume sleep time is normally distributed. What is the probability that:

(a) A randomly selected population member sleeps more than 9 hours

(b) In a random sample of 42 people, the sample mean is more than 9 hours

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Business Analytics And Statistics

ISBN: 9780730363330

1st Edition

Authors: Ken Black, John Asafu Adjaye, Paul Burke, Nelson Perera, Carl Sherwood, Saleh A. Wasimi

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Question Posted: Jan 27, 2020 01:27 PM

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A recent survey of Australians found that mean sleep time was 8 hours with a standard deviation

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8 3 n 42 a from Table A5 the area for z 33 is 1293 ProbX 9 5...View the full answer

Business Analytics And Statistics

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