JEE Math Practice Question
In an experiment with 15 observations on $$x$$, then following results were available: $$\sum {{x^2}} = 2830$$, $$\sum x = 170$$ One observation that was 20 was found to be wrong and was replaced by the correct value 30. Then the corrected variance is :
- A.188.66
- B.177.33
- C.8.33
- D.78.00
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