Portfolio Beta = (20/50)(1.3)+(12/50)(1.0)+(18/50)(0.8)=1.048
A portfolio's beta reveals how much more volatility it has relative to the market. The danger of your existing investments is represented by volatility. The more volatile your portfolio is (greater beta), the more dramatically it will fluctuate and record a loss in the event of a panic sale.
A stock with a beta above 1.0 fluctuates more than the market over time. A stock's beta is a little less than 1.0 if it fluctuates less than the market. Low-beta stocks carry less risk but have lower potential returns whereas high-beta stocks are considered to carry greater risk but have larger potential returns.
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