If $f(x) = \dfrac {1}{\sqrt {2\pi}} e^{-\dfrac {x^{2}}{2}}$, then for which of the following values of $x$ does $f(x) = 0.33$?
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If $f(x) = \dfrac {1}{\sqrt {2\pi}} e^{-\dfrac {x^{2}}{2}}$, then for which of the following values of $x$ does $f(x) = 0.33$?