The Mean And Standard Deviation Of A Group Of 100 Observations Were Found To Be 20 And 3, Respectively. Later On, It Was Found That Three Observations Were Incorrect, Which Were Recorded As 21, 21, And 18. Find The Mean And Standard Deviation If The Incorrect Observations Are Omitted. Doubt Answers

Deepika Mishra

Class 11th

Maths

2 years ago

The mean and standard deviation of a group of 100 observations were found to be 20 and 3, respectively. Later on, it was found that three observations were incorrect, which were recorded as 21, 21, and 18. Find the mean and standard deviation if the incorrect observations are omitted.

1 Answer