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Lydia 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 13
Drums 2
Keyboard 7
ighth Grade Students
Instrument # of Students
Guitar 11
Bass 8
Drums 12
Keyboard 11
Based on these results, express the probability that an eighth grader chosen at random will play an instrument other than keyboard as a fraction in simplest form.
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