Liliana wants to start a seventh-grade computer club at hamden middle school. she surveyed 20 seventh-grade students at the town park. she asked each student how many hours they spend on their computers each week. she obtained the following results.
8, 15, 0, 11, 12, 13, 16, 13, 0, 4, 17, 14, 30, 13, 5, 12, 1, 13, 12, 21
what is the ratio of the total number of students who used their computers to the total number of students surveyed?
a. 2/18 or 1/9
b. 18/2 or 9/1
c. 2/20 or 1/10
d. 18/20 or 9/10