The total number of seventh grade students is 36 (7 guitar + 12 bass + 6 drums + 11 keyboard). The number of seventh grade students who play guitar is 7.
The probability that a seventh grader chosen at random will play the guitar is 7/36. This fraction is already in simplest form.
Ai Mi recorded the grade-level and instrument of everyone in the middle school School of Rock below.
Seventh Grade Students
Instrument # of Students
Guitar 7
Bass 12
Drums 6
Keyboard 11
Eighth Grade Students
Instrument # of Students
Guitar 9
Bass 15
Drums 4
Keyboard 14
Based on these results, express the probability that a seventh grader chosen at random will play the guitar as a fraction in simplest form.
Answer
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