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please help with the entirety of #5. I have included the answer given by my teacher for reference. This is due by 10pm, please help!!

please help with the entirety of #5. I have included the answer given by my teacher for reference. This is due by 10pm, please help!! Thanks(:

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5. A researcher would like to estimate the mean number of miles on a 3-year-old Ford Focus. How many cars should be in a sample to estimate the mean number of miles to within 1200 miles with 96% confidence, assuming the population standard deviation is 9800 miles? x = miles on a three - year-old Ford Focus n = ANSWER : 282 Page 234 of 286

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