A school population consists of 33 seventh-, 47 eighth-, and 37 ninth-grade students. If we select one child at random from the total group of students, what is the probability that the child is in the ninth-grade

Step-by-step explanation:

Total number of students: 33 + 47 + 37 = 117 students

Students in 9th class = 37

So probabilty of selecting a 9th class student from a class of 117 students is:

=> (Total student in 9th class) / (Total student in the sample)

=>37/117 = >Ans