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Statistics question: For the following values: 12, 17, 20, 14, 11, 21, 23, 9, 11, 11,...

Statistics question:

For the following values: 12, 17, 20, 14, 11, 21, 23, 9, 11, 11, 15, 16

a) Find the mean, the median, and the mode

b) Calculate the standard deviation, the table should be: |x | (x - x') | (x-x)^2|

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