Q4

MCQ1 mark, −0.33

The probability density function $f(x)$ of a random variable $X$ which takes real values is

f(x)=\frac{1}{3 \sqrt{2 \pi}} \exp \left(-\frac{x^{2}}{18}\right), \quad x \in(-\infty,+\infty)

Which one of the following statements is correct about the random variable $X$ ?

(A)

$X$ is an exponential random variable

(B)

$X$ is a normal random variable

(C)

$X$ is a Poisson random variable

(D)

$X$ is a uniform random variable

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