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Sofi is from Mexico and is looking at flights. She wants to estimate the average cost...

Sofi is from Mexico and is looking at flights. She wants to estimate the average cost of a flight to Quer´etaro (where she’s from) with a 95% confidence interval, with a margin of error of $26. She assumes that the standard deviation of flight costs is $45. How many flights should she look at in order to construct the confidence interval?

a. 12 b. 11 c. 299 d. 300

Math   Statistics-And-Probability   
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