Question 2 [GP2.CAP25] The following bar graph summarizes the number of nights per week a sample of college students spent studying. 12- 11 10 - 9 8 - Frequency 6 - 5 2 1 2 3 4 5 Nights Studying (per week) [a.] How many students were observed in this study? [2] [b.] How many students studied three nights per week? [2] [c.] How many students studied at least 3 nights per week? [2]