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QWhat is the 13th result, given that the average of 25 results is 18, the average of the first 12 results is 14, and the average of the last 12 results is 17?
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To find the 13th result, given that the average of 25 results is 18, the average of the first 12 results is 14, and the average of the last 12 results is 17, we can first determine the sum of the 25 results. This can be done by multiplying the average of the results by the total number of results, as follows: Sum of results = 18 * 25 = 450 We can then determine the sum of the first 12 results by multiplying the average of these results by the number of results, as follows: Sum of first 12 results = 14 * 12 = 168 Similarly, we can determine the sum of the last 12 results by multiplying the average of these results by the number of results, as follows: Sum of last 12 results = 17 * 12 = 204 The 13th result is then equal to the sum of the 25 results minus the sum of the first 12 results and the last 12 results, or: 13th result = 450 - (168 + 204) = 450 - 372 = 78
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