Question

Iarrecorded the grade-level and instrument of everyone in the middle school Schoolof Rock below.Seventh Grade StudentsEighth Grade StudentsInstrument # of StudentsInstrument # of Students1279GuitarBassDrumsKeyboard14GuitarBassDrumsKeyboard4355Based on these results, express the probability that a seventh grader chosen atrandom will play the drums as a decimal to the nearest hundredth.

Answer 1

Let's take a look at the seventh graders table.

Seventh grade has a total of

`12+9+4+5=30`

30 students.

Out of those 30 students, 4 play the drums. Therefore, the probability that a seventh grader chosen at random will play the drums is:

`(4)/(30)\rightarrow(2)/(15)\rightarrow0.13`