Question

The mean of 90 items was found to be 45. Later on, it was discovered that two items were misread as 26 and 19 instead of 62 and 09 respectively. The correct mean is (approximately)
(1) 49.0
(2) 45.0
(3) 45.3
(4) 49.3

Answer 1

sum=90×45=4050,

Actual sum=4050-26-19+62+9=4076,

therefore

actual mean =4076/90= 45.28 approxx