Bashir recorded the grade-level and instrument of everyone in the middle school School of Rock below . Seventh Grade Students Eighth Grade Students Instrument # of Students Instrument # of Students 8 Guitar 12 8Bass 13 Guitar Bass Drums Keyboard 10 9 Drums Keyboard 9 LO Based on these results, express the probability that a seventh grader chosen at random will play the keyboard as a fraction in simplest form.

Question

25-10-2022
Mathematics

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Bashir recorded the grade-level and instrument of everyone in the middle school School of Rock below . Seventh Grade Students Eighth Grade Students Instrument # of Students Instrument # of Students 8 Guitar 12 8Bass 13 Guitar Bass Drums Keyboard 10 9 Drums Keyboard 9 LO Based on these results, express the probability that a seventh grader chosen at random will play the keyboard as a fraction in simplest form.

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NohealaniK584672 NohealaniK584672 · Answer 1 · 2022-10-25T21:34:01+02:00

The idea is almost the same as before:

The probability is again # keyboard players of seventh grade /#total of students of seventh grade = 9/35.

It is the answer because we can't simplify 9/35 (there are no common divisors distinct from 1)

Additional comment: The dates on the eighth-grade students shouldn't be considered because we are choosing a student of seventh-grade, so the eighth-grade students don't "affect" the probability.