If aâ rifleman's gunsight is adjusted correctly but he has shakyâ arms, he might shoot bullets scattered widely around theâ bull's-eye target. Draw a sketch of the target with the bullet holes. Does this show variationâ (lack ofâ precision) orâ bias?

Lack of precision is the cause

Step-by-step explanation:

Based on the condition that the riffle man has a shaky arm, in my honest opinion I would say it's due to lack of precision caused by his shaky arm

Since the riffle man might shoot bullets scattered widely around the bulls eye he lacks precision. Precision has to do with shooting a particular spot consistently

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