How are the heights of peaks in a mass spectrum related to isotopes, and why can't the relative atomic mass of lead be calculated from the provided image?

The image provided does not include the mass spectrum for lead. Therefore, it is not possible to calculate the relative atomic mass of lead.

Here is the explanation for why peaks have different heights:

The height of each peak in a mass spectrum represents the relative abundance of a particular isotope. Different isotopes of an element occur in nature in varying proportions. A taller peak indicates a higher natural abundance of that specific isotope, while a shorter peak indicates a lower natural abundance.