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An initial work sampling survey to estimate the percentage of time that MRI equipment is idle..

An initial work sampling survey to estimate the percentage of time that MRI equipment is idle between 8:00AM and 8:00PM, found that the MRI was idle in 9 of the 120 observations. a)Determine the % of idle time.
b)From the initial results, approximately how many observations would it require to estimate the actual percentage of idle time to within4 percent,with confidence of 95 percent?

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