SOLUTION: Harold calculated the mean of 5 numbers to be 68. Then he found that he made an error and had written 70 for one of the numbers when he should have written 80. What is the mean of

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Harold calculated the mean of 5 numbers to be 68.
Let n = sum of the 5 numbers
= 68
n = 5*68
n = 340
Then he found that he made an error and had written 70 for one of the numbers when he should have written 80.
This raises n by 10, 350 is the correct sum
= 70 is the correct mean