1. The problem asks to find the area under the standard normal curve between $z=0$ and $z=1.2$. 2. The standard normal distribution is symmetric about zero, and the total area under the curve is 1. 3. The area between $z=0$ and a positive $z$-value corresponds to the cumulative distribution function (CDF) value at that $z$ minus the CDF at 0. 4. The CDF at $z=0$ is 0.5 because the distribution is symmetric. 5. Using standard normal distribution tables or a calculator, the CDF at $z=1.2$ is approximately 0.8849. 6. Therefore, the area between $z=0$ and $z=1.2$ is $0.8849 - 0.5 = 0.3849$. 7. This matches option ก. 0.3849. Final answer: 0.3849