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In an experiment with 15 observations of...

In an experiment with 15 observations of x the following results were available `sum x^2=2830 sum x=170` one observation that was 20 was found to be wrong and it was replaced by its correct value of 30 Then the corrected variance is (1) `8.33` (2) `78` (3) `188.66` (4) `177.33`

A

78

B

`188.66`

C

`177.33`

D

`833`

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