Cumulative frequency for a class interval represents:
A. The sum of frequencies of all classes up to and including that class
B. The difference between the upper and lower class limits
C. The average frequency across all classes
D. The frequency of that class only
Answer: Option A
Solution (By JKSSB Mock Tests)
Cumulative frequency is the running total of frequencies, calculated by adding the frequency of each class to the sum of frequencies of all preceding classes, useful for percentile calculations.
Explanation:
Harmonic mean involves reciprocals, so zero makes it undefined. Geometric mean with zero is zero, but it is defined; arithmetic and median unaffected.
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