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    Standard deviation of the S&P Composite Index: Can it be 20.3%?

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    How could the S&P Composite Index have a standard deviation of 20.3% if the historical standard deviation of common stocks has been 20.5% and the small company stocks have been 33.3%. I do not quite understand this, can you explain this?

    © BrainMass Inc. brainmass.com March 4, 2021, 6:20 pm ad1c9bdddf
    https://brainmass.com/business/profitability-index/standard-deviation-of-the-s-p-composite-index-can-it-be-20-3-41019

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    Because the formula of Variance is
    Vp = W1^2 * V1 + W2^2 * V2 + 2W1*W2*Cov(1,2)
    If Cov(1,2) < SQRT(V1*v2),
    W1^2 * V1 + W2^2 * ...

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