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A continuous random variable $X$ has a probability density function $f(x)=e^{-x}, 0< x< \infty$.  then $P\{X> 1\}$

  1. $0.368$
  2. $0.5$
  3. $0.632$
  4. $1.0$
in Probability & Statistics by (1.5k points)
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