A statistician working in the marketing and sales department of an exporting company wants to compare the sales amounts of A, B and C personnel who sell the products they produce. It is desired to compare whether there is a difference between the sales figures of three different personnel according to the 0.05 significance level. Find the KW calculation value. A B C 17 13 10 10 15 20 21 12 15 9 18 12 12 15

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