6.2 Applying the 68–95–99.7 rule

The average amount you spend on a lunch during the week is not known. Based on past experience, you are willing to assume that the standard deviation is about $2. You take a random sample of 36 lunches, and apply the central limit theorem.

Round your answer to 2 decimal places.

Fill in the blank:

The 68–95–99.7 rule says that the probability is about 0.95 that is within $ _______ of the population mean .

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