1. The problem asks to sketch the region corresponding to "Left of a value" on a normal curve. 2. A normal curve represents a normal distribution, which is symmetric and bell-shaped. 3. "Left of a value" means shading the area under the curve to the left of a specific point $x = a$. 4. This shaded area corresponds to the cumulative probability $P(X \leq a)$. 5. To sketch, draw the normal curve and shade the region from $-\infty$ up to $a$ on the x-axis. 6. This area represents the probability that the random variable $X$ is less than or equal to $a$. Final answer: The shaded region is the area under the normal curve to the left of the value $a$, representing $P(X \leq a)$.