Compute the residual risk measure for portfolio B. Round off your final answer to three digits after the decimal point.

	Excess Returns over the risk free rate
Month	A	B	M
1	5.63	3.86	3.25
2	-2.86	-0.10	-7.36
3	8.56	3.58	4.32
4	13.18	38.14	15.46
5	10.83	13.93	8.76
6	11.43	40.13	15.41
7	-1.61	-7.79	-5.10
8	7.61	1.88	3.79
9	-5.67	1.90	-14.22
10	9.81	13.14	7.54
11	-1.96	-4.63	-2.08
12	2.83	-0.72	2.46