Casey likes to run she runs an additional 1/4 mile each day. on the last day she ran 1 1/4 miles if she ran 1/2 mile on her first day for how many days has she been running

The line plot below represents the number of letters written to overseas pen pals by the students at the waverly middle school.each x represents 10 students. how many students wrote more than 6 and fewer than 20 letters. a.250 b.240 c.230 d.220