What do the circled letters mean? What do these graphs represent?

you can rapire that all tie must be below, my, Tasks A_zwwer the following qustions in Excel. Assume the following parametas for arnt.hly returns of 5 stocks: B 0.51% 0.62% 6.1% 16.2% B C D A 0.21 0.31 0.41 0.51 c 0.73% 10.3% B 0.32 0.12 0.52 D E 0.84% 0.95% 0.2% 12.4% 8.5% 0.53 0.54 l. (hmpute Lhe variance-covarialuv Inatrix of the 5 stocks. 2. Create n graph with the volatility as the horin.ntal axis and the expected return a vertical axis. For each stock, place a black dot on the graph.