作业帮① [(−3% − 5.4%)^2×0.1 + (3% − 5.4%)^2×0.3 + (7% − 5.4%)^2×0.4 + (10% − 5.4%)^2×0.2 ]^1/2②[(2% − 9.4%)^2×0.1+ (4% − 9.4%)^2×0.3 + (10% − 9.4%)^2×0.4 + (20% − 9.4%)^2×0.2 ]^1/2注：但
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/11 00:52:35
![① [(−3% − 5.4%)^2×0.1 + (3% − 5.4%)^2×0.3 + (7% − 5.4%)^2×0.4 + (10% − 5.4%)^2×0.2 ]^1/2②[(2% − 9.4%)^2×0.1+ (4% − 9.4%)^2×0.3 + (10% − 9.4%)^2×0.4 + (20% − 9.4%)^2×0.2 ]^1/2注：但](/uploads/image/z/8692697-65-7.jpg?t=%E2%91%A0+%5B%28%26%238722%3B3%25+%26%238722%3B+5.4%25%29%5E2%C3%970.1+%2B+%283%25+%26%238722%3B+5.4%25%29%5E2%C3%970.3+%2B+%287%25+%26%238722%3B+5.4%25%29%5E2%C3%970.4+%2B+%2810%25+%26%238722%3B+5.4%25%29%5E2%C3%970.2+%5D%5E1%2F2%E2%91%A1%5B%282%25+%26%238722%3B+9.4%25%29%5E2%C3%970.1%2B+%284%25+%26%238722%3B+9.4%25%29%5E2%C3%970.3+%2B+%2810%25+%26%238722%3B+9.4%25%29%5E2%C3%970.4+%2B+%2820%25+%26%238722%3B+9.4%25%29%5E2%C3%970.2+%5D%5E1%2F2%E6%B3%A8%EF%BC%9A%E4%BD%86)
① [(−3% − 5.4%)^2×0.1 + (3% − 5.4%)^2×0.3 + (7% − 5.4%)^2×0.4 + (10% − 5.4%)^2×0.2 ]^1/2②[(2% − 9.4%)^2×0.1+ (4% − 9.4%)^2×0.3 + (10% − 9.4%)^2×0.4 + (20% − 9.4%)^2×0.2 ]^1/2注：但
① [(−3% − 5.4%)^2×0.1 + (3% − 5.4%)^2×0.3 + (7% − 5.4%)^2×0.4 + (10% − 5.4%)^2×0.2 ]^1/2
②[(2% − 9.4%)^2×0.1+ (4% − 9.4%)^2×0.3 + (10% − 9.4%)^2×0.4 + (20% − 9.4%)^2×0.2 ]^1/2
注：但望能体谅!
① [(−3% − 5.4%)^2×0.1 + (3% − 5.4%)^2×0.3 + (7% − 5.4%)^2×0.4 + (10% − 5.4%)^2×0.2 ]^1/2②[(2% − 9.4%)^2×0.1+ (4% − 9.4%)^2×0.3 + (10% − 9.4%)^2×0.4 + (20% − 9.4%)^2×0.2 ]^1/2注：但
① [(−3% − 5.4%)^2×0.1 + (3% − 5.4%)^2×0.3 + (7% − 5.4%)^2×0.4 + (10% − 5.4%)^2×0.2 ]^1/2
=[0.0007056+0.0001728+0.0001024+0.0004232]^1/2
=0.001404^1/2=≈0.0375
②[(2% − 9.4%)^2×0.1+ (4% − 9.4%)^2×0.3 + (10% − 9.4%)^2×0.4 + (20% − 9.4%)^2×0.2 ]^1/2
=[0.0005476+0.0008748+0.0000144+0.0022472]^1/2
=0.003684^1/2≈0.06070