Question

Lydia recorded the grade-level and instrument of everyone in the middle school School of Rock below.

Seventh Grade Students
Instrument # of Students
Guitar 7
Bass 13
Drums 2
Keyboard 7



ighth Grade Students
Instrument # of Students
Guitar 11
Bass 8
Drums 12
Keyboard 11




Based on these results, express the probability that an eighth grader chosen at random will play an instrument other than keyboard as a fraction in simplest form.

Answer 1

31/42

Step-by-step explanation:

there are 42 students in 8th grade

31 dont play keyboard so 31/42 = 73.8% chance

Answer 2

The probability that an eighth grader chosen at random will play an instrument other than keyboard can be expressed as 31/42.

Step-by-step explanation:

To find the probability that an eighth grader chosen at random will play an instrument other than keyboard, we need to calculate the number of eighth graders playing instruments other than keyboard and divide it by the total number of eighth graders.

From the data provided, we know that there are 8 eighth-grade students playing bass, 11 playing guitar, and 12 playing drums.

Therefore, the total number of eighth graders playing instruments other than keyboard is 8 + 11 + 12 = 31.

The total number of eighth graders is given as 8 + 11 + 12 + 11 = 42.

So, the probability can be expressed as 31/42, which is the fraction in simplest form.