From the figure below, what is (approximately) the most likely value for the frequency of the mean size class of the smallest cohort? 00 90 80 70 60 50 50 Frequency 00 40 30 20 20 10 0 12 15 18 21 24 27 30 Size Class (mm) Frequency (per m²) of size classes of cockles (Cerastoderma edule) found Between 45-50 A Above 90 12mm 26mm

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