An information retrieval system operates on a document collection of 20 documents d1, ..., d20. For a search query the system returned the 13 documents d1, d3, d4, d8, d10, d11, d12, d14, d15, d17, d18, d19, d20. An expert jury decided that for the same query the 11 documents d1, d2, 3, 7, 8, d9, d10, d14, d15, d16, d17, of the collection were actually relevant. 1. Calculate the precision of the system for this search query. 2. Calculate the recall of the system for this search query. 3. Calculate the balanced F -measure (a.k.a. F1) of the system for this search query. 4. Calculate the accuracy of the system for this search query.