A market researcher is analyzing the modal class of household sizes from a grouped frequency table:

| Household Size | Frequency | |---|---| | 1–2 | 15 | | 3–4 | 40 | | 5–6 | 25 | | 7–8 | 10 |

Using the standard interpolation formula for the mode: $\text{Mode} = L + \left(\frac{f_1 - f_0}{2f_1 - f_0 - f_2}\right) h$, where class boundaries are continuous (e.g., 2.5 to 4.5 for the modal class, giving $h=2$). What is the interpolated mode?