Question

9th 10th 11th 12th row total
plays an instrument 7 3 5 9 24
does not play an instrument 14 22 17 9 62
column total 21 25 22 18 86
eddie will enter high school next year. his older brother tells him that everybody in high school plays a musical instrument. skeptical, eddie decides to investigate. throughout the next month, he asks a randomly selected sample of high - school students whether they play an instrument. the table shows what eddie finds. rounded to the nearest tenth of a percent, what percentage of all students that play an instrument are in 10th grade?
(ignore the % symbol when entering your answer. for example, if the answer is 32.4%, enter 32.4.)

Explanation:

Step1: Identify relevant numbers

Number of 10th grade students who play an instrument: 3
Total number of students who play an instrument: 24

Step2: Calculate the percentage

Percentage = $\frac{\text{Number of 10th grade instrument players}}{\text{Total instrument players}} \times 100$
Substitute the values: $\frac{3}{24} \times 100 = 12.5$

Answer:

12.5