Question: 2. Market B started using automatic payment machine, however they have a doubt about the utilization ratio of this new machine. Based on their initial

2. Market B started using automatic payment machine, however they have a doubt about the utilization ratio of this new machine. Based on their initial observations they think idle time of the machine is at least 50% (p=0.5). They want to complete a formal analysis with confidence level of 90% and an error bound of maximum 7 percent (e=0.07). Calculate the minimum number of observations needed for this study.

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