introduction to finance chapter; risk and return

b) Kossan Berhad is one of the glove company in Malaysia. Kossan Berhad is evaluating a Security XYZ. The information of the Security XYZ is as follow: (10 MARKS) Rate of return 0.30 0.15 0.20 0.15 Probability 0.20 0.30 0.40 0.50 Calculate standard deviation of Security B