Data for Q. 65-66 are given below. Solve the problems and choose the correct answers.
Let $X$ be the Gaussian random variable obtained by sampling the process at $t=t_{i}$ and let
\[\mathrm{Q}(\alpha)=\int_{\alpha}^{\infty} \frac{1}{\sqrt{2 \pi}} e^{\frac{x^{2}}{2}} d y\]
The probability that $[x \leq 1]$ is
- $1-\mathrm{Q}(0.5)$
- $\mathrm{Q}(0.5)$
- $\mathrm{Q}\left(\frac{1}{2 \sqrt{2}}\right)$
- $1-\mathrm{Q}\left(\frac{1}{2 \sqrt{2}}\right)$