Question

multiple choice question
the value shown on the vertical axis of a cumulative frequency polygon for a particular class is found by:
counting the number of observations less than the upper limit of the class
counting the number of observations within the class
dividing the class frequency by the total number of observations
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Explanation:

A cumulative frequency polygon (ogive) tracks the total number of observations up to a certain point. For any class, its vertical axis value represents the cumulative frequency, which is the total count of all observations that are less than the upper limit of that class. Counting observations within the class is the class frequency, not cumulative frequency. Dividing class frequency by total observations gives relative frequency, not cumulative frequency.

Answer:

counting the number of observations less than the upper limit of the class