You calculate frequency density by dividing each class frequency by its corresponding class width, so that the area of each bar represents the frequency. I’ve been reviewing old survey data from college, and it’s clear that using unequal intervals without this correction gives a completely misleading picture of the distribution. Actually, I see my father’s bus route in this—some villages are close, others far apart; you can’t just count stops to understand the crowding, you have to consider the distance between them.
#exams#study
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