12. What would be the expected return and variance of a portfolio with 60% invested in Google and 40% invested in Yahoo? Is the risk of the portfolio higher or lower than the risk of the individual securities?

Month	Monthly Returns (%)			Month	Monthly Returns (%)			Month	Monthly Returns (%)
Ended	Yahoo	Google	S&P500	Ended	Yahoo	Google	S&P500	Ended	Yahoo	Google	S&P500
Dec-07	-13.241	-0.219	-0.692	Dec-06	-5.442	-5.018	1.403	Dec-05	-2.610	2.457	0.036
Nov-07	-13.794	-1.980	-4.182	Nov-06	2.544	1.767	1.899	Nov-05	8.818	8.806	3.778
Oct-07	15.861	24.632	1.590	Oct-06	4.193	18.534	3.257	Oct-05	9.249	17.595	-1.668
Sep-07	18.093	10.096	3.736	Sep-06	-12.314	6.174	2.575	Sep-05	1.561	10.650	0.810
Aug-07	-2.237	1.029	1.497	Aug-06	6.227	-2.087	2.376	Aug-05	-0.060	-0.612	-0.912
Jul-07	-14.302	-2.430	-3.097	Jul-06	-17.758	-7.805	0.616	Jul-05	-3.781	-2.172	3.717
Jun-07	-5.470	4.979	-1.660	Jun-06	4.463	12.778	0.133	Jun-05	-6.855	6.088	0.143
May-07	2.354	5.628	3.486	May-06	-3.630	-11.035	-2.875	May-05	7.826	26.032	3.179
Apr-07	-10.387	2.885	4.428	Apr-06	1.612	7.164	1.342	Apr-05	1.770	21.877	-1.896
Mar-07	1.393	1.938	1.116	Mar-06	0.624	7.551	1.244	Mar-05	5.051	-3.979	-1.769
Feb-07	9.007	-10.379	-1.950	Feb-06	-6.735	-16.188	0.271	Feb-05	-8.350	-3.900	2.103
Jan-07	10.846	8.908	1.511	Jan-06	-12.264	4.291	2.648	Jan-05	-6.555	1.468	-2.437