Fill in the blank. A random sample of 25 roundtrip flights between Philadelphia and Dallas has an average airfare of $393.50 with a sample standard deviation of $50.30. The 95% confidence interval around this sample mean is Round to two decimal places as needed. O A. ($372.74, $414.26) O B. ($388.47, $398.53) OC. ($383.44, $403.56) O D. ($353.26, $433.74)

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A: Given,           Z -score=4.45           A basket ball player has a height of  6 feet 9…

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A: Given Mean =21.2 Standard deviation=5.7

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A: Sample size, n = 121 Mean = 49 Variance σ2 = 9 We have to find the standard deviation.

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Q: d the mean and standard deviation of the number of red-headed Scots in a randomly selected group of…

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Q: Find the standard deviation. Round to one more place than the data. 7 19, 20, 8, 17 14 8 20 12 OA…

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