The difference between the actual and measured value.
Example: When your instrument measures in "1"s, then any value between 6½ and 7½ is measured as "7", so the error is plus or minus ½.
Which we write as 7 ±0.5
Example: When your instrument measures in "1"s, then any value between 6½ and 7½ is measured as "7", so the error is plus or minus ½.
Which we write as 7 ±0.5
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