B3. This question concerns the variable "individual rent," which represents the individual's share of the rent paid for off-campus housing. Note that many survey respondents did not report their individual rent.

a. How many students in the survey reported the rent that they pay individually? b. What are the minimum and maximum individual rents paid by students in the sample? c. What is the average individual rent? What is the standard deviation of the rent? d. What percentage of survey respondents left this question blank? Is the fact that some students chose not to answer the question likely to bias the results upward, downward, or not in any particular direction? Explain your answer.