u=(x-μ)/σ=(x-2)/σ
x≥1,x-2≥-1;
u=(x-2)/σ≥-1/σ
P(u≥-1/σ)=5/9=1-P(u≤-1/σ)=1-Φ(-1/σ)=1-(1-Φ(1/σ))=Φ(1/σ)
1/σ=0.14,σ=7.14
匿名回答于2024-05-22 01:06:48