The cumulative distribution function (c.d.f.) $F(x)$ of a discrete random variable $X$ is given by the following table:
$X$$-3$$-1$$0$$1$$3$$5$$7$$9$
$F(X=x)$$0.1$$0.3$$0.5$$0.65$$0.75$$0.85$$0.90$$1$

Then,find the value of $\frac{P[X=-3]}{P[X < 0]}$.

  • A
    $\frac{1}{4}$
  • B
    $\frac{1}{3}$
  • C
    $\frac{1}{6}$
  • D
    $\frac{1}{7}$

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