AQA Statistics 1 5.05 Finding an Unbiased Estimator for the Variance

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Is there an easier was to do this because I don't understand what the top bit of the equation means? Please explain if possible

kiarheawedderburn
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In terms of the context of the question, will we be asked specifically to calculate an unbiased estimation?

jamesforshaw
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Slightly confused... does the unbiased estimator for the variance find the variance of the means (sigma^2/n) or does it find the variance of the population (sigma^2)?

nopa