Let $f ( t ) = 0.2 e ^ { - 2 t } , t \geq 0$ be the probability density function of a random variable T, where t is the time that a customer spends in line at teller's window before being served. What is mean of the probability density function?

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The Answer of Let $f ( t ) = 0.2 e ^ { - 2 t } , t \geq 0$ be the probability density function of a random variable T, where t is the time that a customer spends in line at teller's window before being served. What is mean of the probability density function?

Let f(t)=0.2e−2t,t≥0f ( t ) = 0.2 e ^ { - 2 t } , t \geq 0f(t)=0.2e−2t,t≥0

Let $f ( t ) = 0.2 e ^ { - 2 t } , t \geq 0$