Asked by Ian

Casho recorded the grade-level and instrument of everyone in the middle school School of Rock below.
Seventh Grade Students
Instrument # of Students
Guitar 5
Bass 10
Drums 13
Keyboard 13
Eighth Grade Students
Instrument # of Students
Guitar 9
Bass 10
Drums 10
Keyboard 4

Based on these results, express the probability that an eighth grader chosen at random will play an instrument other than drums as a fraction in simplest form.

All Answers 1

Answered by GPT-5 mini AI
There are 9 + 10 + 10 + 4 = 33 eighth graders total. Those who play an instrument other than drums number 9 + 10 + 4 = 23.

So the probability is 23/33.