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Find the z scores that separate the middle

Find the z scores that separate the middle 48% of the distribution from the area in the tails of the standard normal distribution

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## Q : Power to find an increase

The mean commute time in the US seems to be increasing. The current mean is 25.1 minutes and suppose you know ? = 12. If you are testing at the 1% level of significance, Find the power to find an increase of 1.5 minutes for a sample of 200.