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A person is trying to establish their average commuting time and records the times everyday. They...

A person is trying to establish their average commuting time and records the times everyday. They found the average commuting time to be 24 minutes with a standard deviation of 3.5 minutes. Approximately, how many commutes do they need to record to be 95% sure that their sample mean is within 1 minute of the true mean.

Math   Statistics-And-Probability   
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Sample size calculation from margin of error. Here sample size required is 47.

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