Final answer:
The ratio of students needed to play the Xylophone in relationship to the Bass Drum is 1/2.
Step-by-step explanation:
The ratio of students needed to play the Xylophone in relationship to the Bass Drum can be found by dividing the number of students playing the Xylophone by the number of students playing the Bass Drum. Let's assume there are 4 students playing the Xylophone and 8 students playing the Bass Drum. The ratio would then be 4/8, which can be simplified to 1/2.