The mean and standard deviation of a group of 100 observations were found to be 20 and 3…
Mathematics · JEE Main · NTA Exams — Statistics and Probability
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, then the mean and standard deviation, if the incorrect observations are omitted, are
- 21, 3.02
- 20, 3.02
- 21, 3.03
- 20, 3.03
Answer
(D) 20, 3.03
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