Mathematics, 28.04.2021 20:50, lucretiak74

According to an IRS study, it takes a mean of 330 minutes for taxpayers to prepare, copy, and electronically file a 1040 tax form. This distribution of times follows the normal distribution and the standard deviation is 80 minutes. A consumer watchdog agency selects a random sample of 40 taxpayers. What is the probability that the sampling error would be more than 20 minutes

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According to an IRS study, it takes a mean of 330 minutes for taxpayers to prepare, copy, and electr...