From the image provided, it shows two overlapping bell-shaped curves, which likely represent two normal distributions. These curves exhibit the following key features:

• The peaks of the curves (which represent the means) are located at different positions. One peak is at approximately $x = 10$ and the other is at $x = 15$. This indicates that the means differ by 5 units.
• The curves appear to have the same width or spread, meaning that their standard deviations are likely equal.

Conclusion:

The correct statement is:

"The two distributions have means that differ by 5 units and equal standard deviations."

Let me know if you need further details or clarifications!

Here are five related questions to deepen your understanding:

1. What is the relationship between the standard deviation and the shape of a normal distribution curve?
2. How does the mean of a distribution affect its position on a graph?
3. What are the implications if two distributions have different means but the same standard deviation?
4. What does the area under a normal distribution curve represent?
5. How would the graph change if the standard deviations of the two distributions were different?

Tip: The mean affects the center of the normal distribution, while the standard deviation affects the spread or width of the curve.