2. Assume that an IR system returns ranked list of 10 total documents for a given query. Assume that according to a gold standard labeling there are 5 relevant documents for this query, and that the only relevant documents in the ranked list are in the 2nd, 3rd, 4th and 8th positions in the ranked results. a. Calculate Recall and Precision values corresponding to relevant documents positions. (8 marks) b. Which is typically more important in web search, Precision or Recall? Justify your answer. (2 marks)