Around 20-30% of students may fail or withdraw from introductory statistics courses. The failure rate for college statistics courses does vary widely depending on the institution, the specific course, and the student population. However, like many other math-intensive courses, statistics can have a relatively high failure rate. This rate is influenced by several factors, including the difficulty of the subject matter, the students' background in mathematics, and the teaching methods employed. It's important to note that these figures are general estimates and can differ significantly in different educational settings or among different student cohorts.