For 7 days, Tom recorded the number of hours he slept each night. He rounds each time to the nearest \frac{1}{4} 4 1 ​ start fraction, 1, divided by, 4, end fraction of an hour. 777\frac{1}{4}7 4 1 ​ 7\frac{1}{2}7 2 1 ​ 7\frac{3}{4}7 4 3 ​ 888\frac{1}{4}8 4 1 ​ 8\frac{1}{2}8 2 1 ​ 8\frac{3}{4}8 4 3 ​ 99 A line plot labeled 7 to 9 with tick marks at every one-fourth unit. Above the tick mark at seven and one-fourth is a column of two dots. Above the tick mark at seven and three-fourths is a column of blue dots. Above the the tick mark at eight and one-fourth is 1 dot. Above the tick mark at eight and one-half there is one blue dot. How many more hours did Tom sleep on the night he slept the most than the night he slept the least?