Determining probability for normal distribution

Reference no: EM1392041

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 standard error of the mean in this example

What is the likelihood the sample mean is greater than 320 minutes

What is the likelihood the sample mean is between 320 and 350 minutes

What is the likelihood the sample mean is greater than 350 minutes

Reference no: EM1392041

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