期望值与标准差

GeoGebra 命令及参数

1. Sequence(a, a, 5, 25) → L_1
2. Random(3, 6) → a
3. Sort(Sample[L_1, a, false]) → L_2
4. Sequence(random(), k, 1, a) → L_3
5. Sum(L_3) → b
6. Sum(L_4) → c
7. Shuffle(L_4) → L_5
8. Flatten(Append[{"p(x)"}, L_5]) → L_7
9. Flatten(Append[{"x"}, L_2]) → L_6
10. TableText({L_6, L_7}, "c|h") → text1
11. Sequence((Element[L_2, i] * Element[L_5, i]), i, 1, a) → L_8
12. Sum(L_8) → d
13. Sequence(((Element[L_2, i] - d)^(2) * Element[L_5, i]), i, 1, a) → L_9
14. Sequence(Text[Element[L_2, i]], i, 1, a) → L_{10}
15. Join({Sequence["+", i, 1, a - 1], {""}}) → L_{12}
16. Sequence("x", i, 1, 6) → L_{13}
17. Sequence(Text[Element[L_5, i]], i, 1, a) → L_{11}
18. Sequence("(" + (Element[L_{10}, i]) + ")(" + (Element[L_{11}, i]) + ")" + (Element[L_{12}, i]), i, 1, a) → L_{14}
19. Sum(L_{14}) → text3
20. Sequence("(" + (Element[L_{10}, i] - d) + ")²" + "(" + (Element[L_{11}, i]) + ")" + (Element[L_{12}, i]), i, 1, a) → L_{15}
21. Sum(L_{15}) → text5