Глупый вопрос

Sep. 22nd, 2008 09:55 pm
psilogic: (Default)
[personal profile] psilogic
Зверски туплю, но вдруг кто помнит:
- почему в формуле дисперсии сумму делят то на N, то на N - 1 и как правильнее?
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