概率论数学考试题

2025-03-02 02:37:04
推荐回答(2个)
回答1:

1. 1/10 1/6
2. (1C10*1C4+1C4*1C3)/2C14=
10/14
3. 1/3 * 4/6 +1/3 * 2/6 +1/3 *3/6=
1/4/(4/6 + 2/6 +3/6)=

4.k^2-k-2≥0 k ≥2
P=3/5

5.P(X+Y)≤1=1/4
P(X+Y)≥1=3/4

回答2:

1. 1/10 1/6
2. (1C10*1C4+1C4*1C3)/2C14=
10/14
3. 1/3 * 4/6 +1/3 * 2/6 +1/3 *3/6=
1/4/(4/6 + 2/6 +3/6)=

4.k^2-k-2≥0 k ≥2
P=3/5

5.P(X+Y)≤1=1/4
P(X+Y)≥1=3/4