a). Expected Return = [Probability(i) * Return(i)]
Stock A's Expected Return = [0.20 * 6%] + [0.55 * 13%] + [0.25 * 18%]
= 1.2% + 7.15% + 4.5% = 12.85%
Stock B's Expected Return = [0.20 * -11%] + [0.55 * 17%] + [0.25 * 37%]
= -2.2% + 9.35% + 9.25% = 16.4%
b). Standard Deviation = [{Probability(i) * (Expected Return - Return(i))2}]1/2
Stock A's Standard Deviation = [{0.20 * (12.85% - 6%)2} + {0.55 * (12.85% - 13%)2} + {0.25 * (12.85% - 18%)2}]1/2
= [9.3845%2 + 0.012375%2 + 6.630625%2]1/2
= [16.0275%2]1/2
= 4.00%
Stock B's Standard Deviation = [{0.20 * (16.4% + 11%)2} + {0.55 * (16.4% - 17%)2} + {0.25 * (16.4% - 37%)2}]1/2
= [150.152%2 + 0.198%2 + 106.09%2]1/2
= [256.44%2]1/2
= 16.01%
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