If the average of 5 observation x, x + 2, x + 4, x + 6 and x + 8 is 11, then the average of the last three 7E observation is?

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If the average of 5 observation x, x + 2, x + 4, x + 6 and x + 8 is 11, then the average of the last three 7E observation is?






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