The total number of seventh grade students playing an instrument other than bass is 10 (Guitar) + 14 (Drums) + 14 (Keyboard) = 38.
Therefore, the probability that a seventh grader chosen at random will play an instrument other than bass is 38/42 = 0.90476190476.
Converting this to a percentage to the nearest whole number, we get 90%.
So, the probability that a seventh grader chosen at random will play an instrument other than bass is 90%.
Ethan recorded the grade-level and instrument of everyone in the middle school School of Rock below.
Seventh Grade Students
Instrument # of Students
Guitar 10
Bass 4
Drums 14
Keyboard 14
Eighth Grade Students
Instrument # of Students
Guitar 6
Bass 6
Drums 15
Keyboard 10
Based on these results, express the probability that a seventh grader chosen at random will play an instrument other than bass as a percent to the nearest whole number.
1 answer