If the error involved in making a certain measurement is a continuous random variable $X$ with probability density function $f(x) = k(4 - x^2)$ for $-2 \leq x \leq 2$ and $f(x) = 0$ otherwise,then $P[-1 < X < 1] = $
- A$\frac{13}{16}$
- B$\frac{1}{2}$
- C$\frac{1}{3}$
- D$\frac{11}{16}$
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