This problem is for A-Level and IB, and it is not in the NEET syllabus…

This problem is for A-Level and IB, and it is not in the NEET syllabus. Two warblers feed at heights described by bell curves of the same spread, $1$ m. Their best heights are $3$ m apart.

1. At the middle height, how much does each species use, as a per cent of its own peak? Use $e^{-9/8} = 0.325$.

1. The overlap of the two curves is $\operatorname{erfc}\left(\dfrac{d}{2\sigma\sqrt{2}}\right)$, where $d$ is the distance and $\sigma$ is the spread. Give it to two decimals, with $\operatorname{erfc}(1.0607) = 0.1336$.