1. **Problem statement:** We have reading comprehension scores of 3,300 Grade 11 students with a mean $\mu=78$ and standard deviation $\sigma=8$, normally distributed. We want to find the area between $z=-1$ and $z=2$, the number of students in that area, and conclusions about their scores. 2. **Formula and rules:** The z-score formula is $$z=\frac{x-\mu}{\sigma}$$ where $x$ is a raw score. The area under the normal curve between two z-scores corresponds to the probability of scores falling in that range. 3. **Find the area between $z=-1$ and $z=2$:** Using standard normal distribution tables or a calculator, $$P(-1