The correct option is
D The difference between actual mean temperature and incorrect mean temperature is
0.8∘C.
The mean of the given data will be calculated as,
Mean=Sum of all data pointsTotal number of data points=22+28+27+24+255=1265=25.2
Since, later on it was found that on day I the temperature was recorded wrong, therefore the data will be represented as,
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1434062/original_19-4.PNG)
As instead of
26, the temperature was recorded as
22, therefore the actual sum of all the data points will be
26−22=4 more.
That is, the actual sum of numbers will be,
Actual sum of temperatures=Sum of temperatures with incorrect data+4=126+4=130
Therefore, the actual mean will be calculated as,
Actual Mean=1305=26
Hence, the difference between the actual mean and incorrect mean temperature is
26−25.2=0.8.
So,the second and the last option are correct.