Question: In a survey, 10 students scored between 70–80, 20 students scored between 80–90, and 15 students scored between 90–100. What is the cumulative frequency for scores between 80 and 100?
(A) 35
(B) 30
(C) 25
(D) 20
Solution:
The cumulative frequency for scores between 80 and 100 includes the students who scored between 80–90 and 90–100.
Cumulative Frequency =20+15=35
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