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10 cards from this deck
It shows frequency per small square in the histogram.
Count squares, then multiply by the area key value.
Multiply number of squares by fish per square.
Frequency = frequency density × class width.
Verify totals and ensure they make sense contextually.
Don't confuse frequency with frequency density.
Estimate the fractional part carefully when counting.
Class width = 50 - 20 = 30.
They simplify frequency calculations without density.
Determine the area value for each small square.
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