設X-N(1.5,4)計算P {x2.5} 設X-N(1.5,4)計算P {x<;=3.5},P {X>;2.5}一道關於概率的問題

設X-N(1.5,4)計算P {x2.5} 設X-N(1.5,4)計算P {x<;=3.5},P {X>;2.5}一道關於概率的問題

k(2 x2_2/3 x3)k=3/8(2)P{1<;x<;3}= =0.8413 P {x<;=3.5} =P{x<;=1}=0.8413 P{x>;2.5}= =0.3085 P {X>;2.5}=1-P {x<;=2.5}=1-P {x<;=0.5}=1-0.6915=0.3085