A consumer watchdog agency selects a random sample of 40, Ask an Expert

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in an irs study, it takes a mean of 330 minutes for taxpayers to prepare, copy, and electtronically file a 1040 tax form. this distribution of times follows normal distribution and standard deviation is 80 minutes. a consumer watchdog agency selects a random sample of 40 taxpayers. What is the standard error of the mean? What is the likehood the sample mean is greater than 320 minutes?

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