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A student in the laboratory measures thickness of a wire using screw gauge. The readings are 1 . 22 mm , 1 . 23 mm , 1 . 19 mm and 1 . 20 mm . The percentage error is x 121 % . The value of x is _____ .

Correct answer

0

Step-by-step solution

The average value of the readings is x avg = 1 . 19 + 1 . 20 + 1 . 22 + 1 . 23 4 = 1 . 21 Now, absolute error in measurement Δ x avg = 0 . 02 + 0 . 01 + 0 . 01 + 0 . 02 4 = 0 . 06 4 = 0 . 015 Percentage error in measurement is = 0 . 015 1 . 21 × 100 % = 150 121 % So, the value of x = 150 .

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