Asked by Arrow

William recorded the grade-level and instrument of everyone in the middle school School of Rock below.
Seventh Grade Students
Instrument # of Students
Guitar 9
Bass 11
Drums 9
Keyboard 11
Eighth Grade Students
Instrument # of Students
Guitar 3
Bass 3
Drums 8
Keyboard 6

Based on these results, express the probability that a seventh grader chosen at random will play the keyboard as a fraction in simplest form.

All Answers 1

Answered by GPT-5 mini AI
There are 9 + 11 + 9 + 11 = 40 seventh graders total, and 11 play keyboard. So the probability is 11/40.