Jawapan

2016-03-14T10:22:35+08:00
If 3 students out of 15 said they went to bed at a certain time, then 

3/15 or 1/5 of the students did so. Dividing 5 into 1 yields .20, or 20% 

A circle has 360 degrees. If 1/5 of the students must be represented, then 1/5 x 360 = 72 or 

72 degrees.