What can be the main advantage of using "median" instead of an "arithmetic mean"? (b) Present a small histogram in which the data has two modes. Mark the locations of those modes on your histogram. (c) Imagine that you are running a small company. Assume that your company uses various technologies that can collect data about your company and its clients. Present three example applications of data analysis which could be addressed using techniques studied in this module. (d) Variance can be computed using the following equation: 1 n-1 (x-m) What is m in this equation? Also, using this equation, explain intuitively what variance is. Answering the first part of this question correctly will help you to answer the second part. (e) Explain how the PageRank algorithm ranks websites using the topology of the hyperlinks between websites. Argue convincingly that this approach produces high rank for websites that are "important". Explain what it means for the website to be important according to the PageRank algorithm.