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To calculate the coefficient of variation (CV), we first need the mean and standard deviation. Step by step: --- Step 1: Find the midpoints (x) of each class interval [ x = \frac{\text{lower limit + upper limit}}{2} ] | Class Interval | Frequency (f) | Midpoint (x) | f × x | | -------------- | ------------- | ------------ | ----- | | 3-4 | 3 _____ _________ ___ ___ _______ ________ _______.
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