Assertion: portfolio's deviation | /r/HasProperty | 49.2 percent
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text: In Edwin J. Elton and Martin J. Gruber's book "Modern Portfolio Theory and Investment Analysis," they concluded that the average standard deviation (risk) of a single stock portfolio was 49.2 percent, while increasing the number of stocks in the average well-balanced portfolio could reduce the portfolio's standard deviation to a maximum of 19.2 percent (this number represents market risk).﻿﻿