Personal income tax returns
According to the IRS, the average tax refund for the 70 million personal income tax returns in 1998 was $800. Assuming a standard deviation of $220, find the probability that for a random sample of 49 returns, the mean refund is between $700 $900.
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A camera with a telephoto lens (f = 220.0mm) is to be focused on an object located first at a distance of 3.5 m and then at 45.0m. Over what distance must the lens be movable?
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