Thirty students at Eastside High School took the SAT on the same Saturday. Their raw scores are given next. (See the Excel Data File.) Consider a frequency distribution of the data that groups the data in classes of 1400 up to 1600, 1600 up to 1800, 1800 up to 2000, and so on. What is the approximate relative frequency of students who scored more than 1600 but less than 1800?
A) 0.17
B) 0.23
C) 0.40
D) 0.77

Question

Thirty students at Eastside High School took the SAT on the same Saturday. Their raw scores are given next.  (See the Excel Data File.) Consider a frequency distribution of the data that groups the data in classes of 1400 up to 1600, 1600 up to 1800, 1800 up to 2000, and so on. What is the approximate relative frequency of students who scored more than 1600 but less than 1800?
A) 0.17 
B) 0.23 
C) 0.40 
D) 0.77

Quizplus · Accepted Answer

We need to group the scores in classes of 1400 up to 1600, 1600 up to 1800, 1800 up to 2000, and so on. 
From the data file, we can see that there are 8 students who scored between 1400 to 1600, 12 students who scored between 1600 to 1800, and 10 students who scored between 1800 to 2000. 
Thus, the relative frequency of students who scored more than 1600 but less than 1800 is 12/30 = 0.4. 
Therefore, the answer is B.

Thirty Students at Eastside High School Took the SAT on the Same