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and 21. The proportion of b and s that gives the minimum variance are equal to respectively. * (T (2 points) 9.3%; 90.7% 90.7%; 9.3% 40.93%; 59.07% 59.07%; 40.93% and 21. The proportion of b and s that gives the minimum variance are equal to respectively. * (T (2 points) 9.3%; 90.7% 90.7%; 9.3% 40.93%; 59.07% 59.07%; 40.93%