Determine the percent of working and idle time

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A bank manager wants to determine the percent of time that tellers are working and idle. She decides to use work sampling, and her initial estimate is that the tellers are idle 30 percent of the time. How many observations should the manager take in order to be 95% confident that the results will not be mroe than 2.5% aware from the true result?

Reference no: EM13111448

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