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John wants to conduct a study to estimate how much time people spend doing outdoor recreation events

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John wants to conduct a study to estimate how much time people spend doing outdoor recreation events. Assume the distribution of outdoor recreation time is normally distributed with a standard deviation of 1.03 hours per week. John plan to use a 95% confidence level and would like a margin of error of 15 minutes (i.e. 0.25 hours) how many people should John include in his study?