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例1.老师在黑板上写了13个自然数,让小明计算平均数(保留两位小数),小明计算的答案是12.43,老师说最后一位数字错了,其他的数字都对。正确的答案应该是什么?
Example 1. The teacher wrote 13 natural numbers on the blackboard so that Xiao Ming would calculate the average (keep two decimals). Xiao Ming’s answer was 12.43. The teacher said the last digit was wrong and the others were right. What should be the correct answer?