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Let $X$ be a normal random variable with mean $1$ and variance $4$. The probability $P \left \{ X \right.<\left. 0 \right \}$  is

  1. $0.5$
  2. greater than zero and less than $0.5$
  3. greater than $0.5$ and less than $1.0$
  4. $1.0$
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