The sum of 100 observations and the sum ...

The sum of 100 observations and the sum of their squares are 400 and 2475, respectively. Later on, three observations, 3, 4 and 5, were found to be incorrect If the incorrect observations are omitted, then the variance of the remaining observations is

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The sum of 100 observations and the sum of their squares are 400 and 2475, respectively. Later on, three observations, 3, 4 and 5, were found to be incorrect If the incorrect observations are omitted, then the variance of the remaining observations is

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