I need to understand the first part of the question

A study of an association between which ear is used for cell phone calls and whether the subject is left-handed or right-handed began with a survey e-mailed to 5000 people belonging to an otology online group, and 717 surveys were returned. (Otology relates to the ear and hearing.) What percentage of the 5000 surveys were returned? Does that response rate appear to be IoW? In general. what is a problem with a very low response rate? - @- Of the 5000 surveys. D% were returned. This response rate to be low. (Round to the nearest wl'iole number as needed.) Tm