Question

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

Seventh Grade Students
Instrument # of Students
Guitar 11
Bass 3
Drums 3
Keyboard 4
Eighth Grade Students
Instrument # of Students
Guitar 4
Bass 10
Drums 6
Keyboard 3

Based on these results, express the probability that an eighth grader chosen at random will play the guitar as a decimal to the nearest hundredth.

Answer 1

0.17

Explanation:

You want the probability that a randomly chosen 8th grader will play the guitar.

Eighth graders

The table tells us that there are 4 eighth grade students that play the guitar. The total number of eighth grade students is 4+10+6+3 = 23. When one is chosen at random, the probability they play the guitar is ...

(4 students)/(23 students) = 4/23 ≈ 0.17

The probability an 8th grader will play the guitar is about 0.17.

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