10.31 Bank manager Art Hill wants to determine the percentage of time that tellers are working and...

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• • 10.31 Bank manager Art Hill wants to determine the percentage of time that tellers are working and idle. He decides to use work sampling, and his initial estimate is that the tellers are idle 15% of the time.

How many observations should Hill take to be 95.45% confident that the results will not be more than {4% from the true result?

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