Average age of a group of 39 students was found to be 13.5 years. But later it w

Average age of a group of 39 students was found to be 13.5 years. But later it was found that 2 students whose ages taken for the average as 12 years and 13 years were actually 10 years and 14 years. How much the actual average should change from 13.5 years?

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