21. 22. 23. is a measure of the difference between numbers in a data collection a. Standard deviation b. Variance C. CAPM d. Total risk e. All of the above f. None of the above When a security has a higher beta than the other securities, it means.... a. The higher the unavoidable risk b. The higher the avoidable risk c. The less unavoidable risk d. e. All of the above f. Reduce the needless risk. None of the above What is the beta for the risk-free rate? a. 1 b. > 1 C.