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3 cards from this section. Quick, good the night before a test.
What is cumulative frequency?
Think about how frequencies add up.
If 5 students scored 50, 6 students scored 60, and 4 students scored 70, what is the cumulative frequency for the score of 60?
Add all the frequencies before this score.
What does cumulative frequency help us understand?
Think about how frequencies can accumulate.
True or False: Cumulative frequency can help in drawing ogives.
Recall what ogives represent again.
A class of students scored the following: 55, 60, 70, 70, 75, 80, 85. Construct a cumulative frequency table and use it to find the 90th percentile of the scores.
Percentiles tell you the score below which a certain percentage lies.
Create an ogive for the cumulative frequency data of ages: 1, 2, 2, 3, 3, 3, 4, 4, 5. Then, use the ogive to determine how many ages fall below the value of 3.
Remember how to read ogives and interpolate values.
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