Savannah recorded the grade-level and instrument of everyone in the middle school School of Rock below.
Seventh Grade Students
Instrument # of Students
Guitar 5
Bass 12
Drums 14
Keyboard 4
Eighth Grade Students
Instrument # of Students
Guitar 12
Bass 5
Drums 10
Keyboard 8
Based on these results, express the probability that a student chosen at random will play the drums as a percent to the nearest whole number.
To find the probability that a student chosen at random will play the drums, we need to first find the total number of students in the middle school School of Rock who play the drums.
For seventh grade students, there are 14 students who play the drums.
For eighth grade students, there are 10 students who play the drums.
So, the total number of students who play the drums is 14 + 10 = 24.
The total number of students in the middle school School of Rock is the sum of all students in each grade level, which is 5 (guitar) + 12 (bass) + 14 (drums) + 4 (keyboard) + 12 (guitar) + 5 (bass) + 10 (drums) + 8 (keyboard) = 70.
Therefore, the probability that a student chosen at random will play the drums is 24/70 ≈ 0.343. Converted to a percent and rounded to the nearest whole number, this is approximately 34%.
So the probability that a student chosen at random will play the drums is 34%.