Question

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
(a) 8.00 (b) 8.25 (c) 9.00 (d) 8.50

Answer 1

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