4. (简答题, 8.0分) The number of credits being taken by a sample of 13 full-time college students for a semester are 12,14,16,15,13,14,15,18,16,16,12,16,15 (1)Caculate the mean, median and mode; (2)Caculate the sample variance and sample stadard deviation.

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A: 7)Given data is11.5, 21.9, 12.7, 9.0, 19.2, 18.5, 19.3, 1.9, 19.2, 0.8, 28.8, 17.7

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A: Formula for sample mean is as follows,   x¯ = Sum of all observations Total number of observations

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A: Given data(x) : 9,10,11,33,4 n = 5 x x2 9 81 10 100 11 121 33 1089 4 16 ∑x=67…

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Q: 110, 115, 112, 127, 112, 130.

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