This workshop, sponsored by AIM and the NSF, will be devoted to arithmetic statistics. We want to formulate a unifying point of view for the Bhargava-Malle and Batyrev-Manin conjectures using (multiple) Dirichlet series. The workshop aims to bring together researchers to explore statistical questions about number fields, class groups, and point counting. It will concentrate on counting problems coming from recent connections between the Bhargava-Malle and Batyrev-Manin conjectures.