Answer: 1.27
Step-by-step explanation:
The portfolio beta is a weighted average of the individual betas of the composite stocks.
Total amount invested = 4,000 + 5,000 + 7,500
= $16,500
Portfolio beta = (4,000/16,500 * 1.44) + (5,000/16,500 * 1.55) + (7,500/16,500 * 1.00)
= 0.3490909 + 0.469697 + 0.45454545
= 1.27333335
= 1.27