Discussion
A seed has principal dimensions \( 8.0 \), \( 4.0 \) and \( 2.0 \) mm. Its geometric mean diameter is
Answer: D
The geometric mean is \( (8 \times 4 \times 2)^{1/3} = 64^{1/3} = 4.00 \) mm. Note that the arithmetic mean of the same dimensions would be 4.67 mm, which is a different quantity altogether and should never be substituted.
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