A questionnaire was given to students in an introductory statistics class during the first week of the course. One question?asked, "How stressed have you been in the last 2 1/2 ?weeks, on a scale of 0 to?10, with 0 being not at all stressed and 10 being as stressed as?possible?" The?students' responses are shown in the frequency distribution below. How many students were involved in the?study?