$$\color{rgb(0,0,0)}X \text{ suit la loi exponentielle de param}\grave{e} \text{tre }\lambda$$

$$\color{rgb(0,0,0)}\lambda$$

$$\color{rgb(0,0,0)}a=$$

$$\color{rgb(0,0,0)}= 1.5$$

$$\color{rgb(0,0,0)}= 2.5$$

$$\color{rgb(0,0,0)}a$$

$$\color{rgb(0,0,255)}P\left( {X \le 1.5 } \right) \approx 0.698806 $$

$$\color{rgb(255,0,0)}1\text{ ua}$$

$$\color{rgb(0,0,255)}\Rightarrow P(X \le a)$$

$$\color{rgb(0,0,255)}\Rightarrow P(a \le X \le b)$$

$$\color{rgb(0,0,255)}\Rightarrow P(X \ge a)$$

$$\color{rgb(0,0,0)}\lambda=$$

$$\color{rgb(0,0,0)}= 0.8$$