If you keep 10% of your cash in the previous portfolio and invest 90% in a stock with such a beta of 2.69, the new portfolio's beta will be 2.67.
According to the selected stocks betas of the securities that make up a portfolio, portfolio beta describes the relative volatility of a portfolio of individual securities when viewed as a whole.
A gauge for a currency's risk level or volatility in relation to the whole market is its beta value. Therefore, a suitable beta will depend on your objectives and risk tolerance. A beta of 1.0 would've been perfect if you wanted to imitate the larger market within your portfolio, perhaps through an index ETF.
New portfolio beta = (0.10 × 2.44) + (0.90× 2.69)
= (0.244 + 2.421)
= 2.67
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