To determine the number of foreign-born people who lived in Washington by 1910, you would need to refer to the specific data presented in the graph you mentioned. However, without access to that graph, I can't provide an exact number.
If you were to analyze the graph, look for the specific figure representing the foreign-born population in 1910. Based on the options you've provided, evaluate the most appropriate range based on what the graph indicates.
If you have specific data points or context from the graph, I can help interpret them!