The mean of 200 items was 50. Later it was discovered that two items were misread as 92 and 8 instead of 192 and 88. Find the correct mean.

Σx = 200 x 50 = 10000

Correct Mean = ΣX - Sum of Incorrect Values + Sum of Correct Value / N

= 10000 - (92 + 8 ) + (192+88)/200 = 10000-100+280/200 = 10180/200

Correct Mean = 50.9