σ=(10-17)²X8+(12-17)²X10+(22-17)²X15+(28-17)²X2+(32-17)²X1/36 怎么算
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/27 17:07:09
![σ=(10-17)²X8+(12-17)²X10+(22-17)²X15+(28-17)²X2+(32-17)²X1/36 怎么算](/uploads/image/z/15247358-62-8.jpg?t=%CF%83%3D%EF%BC%8810-17%29%26%23178%3BX8%2B%EF%BC%8812-17%29%26%23178%3BX10%2B%EF%BC%8822-17%29%26%23178%3BX15%2B%EF%BC%8828-17%29%26%23178%3BX2%2B%EF%BC%8832-17%29%26%23178%3BX1%2F36+%E6%80%8E%E4%B9%88%E7%AE%97)
σ=(10-17)²X8+(12-17)²X10+(22-17)²X15+(28-17)²X2+(32-17)²X1/36 怎么算
σ=(10-17)²X8+(12-17)²X10+(22-17)²X15+(28-17)²X2+(32-17)²X1/36 怎么算
σ=(10-17)²X8+(12-17)²X10+(22-17)²X15+(28-17)²X2+(32-17)²X1/36 怎么算
σ=(10-17)²X8+(12-17)²X10+(22-17)²X15+(28-17)²X2+(32-17)²X1/36
=(-7)²X8+(-5)²X10+(5)²X15+(11)²X2+(15)²X1/36
=49x8+*(10+15)+121x2+225x1/36
=397+502+242+225x1/36
=1141+225x1/36