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13. The following are the percentages of ash content in 12 samples of coal found in close proximity: 9.2. 14.1.9.8, 12.4,16.0,12.6,22.7, 18.9,210,14.5,20.4.16.9 Find the (a)

13. The following are the percentages of ash content in 12 samples of coal found in close proximity: 9.2. 14.1.9.8, 12.4,16.0,12.6,22.7, 18.9,210,14.5,20.4.16.9 Find the (a) sample mean, and (b) sample standard deviation of these percentages

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