This textbook emphasizes the applications of statistics and probability to finance. It reviews the basics and advanced topics are introduced, including behavioral finance. The book serves as a text in courses, and those in the finance industry can use it for self-study.
I had the unfortunate experience of using this book in a class. Aside from the typos, I was underwhelmed with the coverage and depth of topics in this book, and that's just with the statistics. The treatment of finance was not particularly strong either. As a practitioner (read stats/quant researcher), I don't think one gets a good sense of how finance and statistics are used in practice.
I do not recommend reading this book. There are a plethora of well-written statistics/finance books available. For example, - "Analysis of Financial Time Series" by Tsay. - Carol Alexander covers some similar topics. - If you want more research/academia, see Campbell, Lo, and Mackinly "The Econometrics of Financial Markets".
If you want to read a broad statistics and finance book, read Ruppert's other graduate-level book "Statistics and Data Analysis for Financial Engineering". It covers more topics and at a level for an introduction.