To find the probability that a seventh grader chosen at random will play the bass, we first need to find the total number of seventh grade students in the School of Rock.
Total number of seventh grade students = 13 (Guitar) + 12 (Bass) + 14 (Drums) + 5 (Keyboard) = 44
The probability of a seventh grader playing the bass is given by:
Probability = Number of seventh grade students playing bass / Total number of seventh grade students
Probability = 12 / 44
Probability = 0.2727
To express this probability as a percentage to the nearest whole number, we multiply by 100:
Probability as a percentage ≈ 27%
Therefore, the probability that a seventh grader chosen at random will play the bass is approximately 27%.
Nora recorded the grade-level and instrument of everyone in the middle school School of Rock below.
Seventh Grade Students
Instrument # of Students
Guitar 13
Bass 12
Drums 14
Keyboard 5
Eighth Grade Students
Instrument # of Students
Guitar 6
Bass 8
Drums 4
Keyboard 11
Based on these results, express the probability that a seventh grader chosen at random will play the bass as a percent to the nearest whole number.
1 answer