Question

1.90一个样本空间有三个样本点,其对应概率分别为2p,p^2,4p-1.求p值.

Answer 1

2p+p^2+4p-1=1

p^2+6p+9=11

(p+3)²=11

p+3=√11 (p+3=-√11 舍去)

p=√11-3

p≈0.316625