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Mean value and relative error from repeated readings

This type of question, asked 2 times: 28 Jun 2022, 23 Jan 2026 S1. All 2 questions below, oldest first.

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  1. Question 1

    28 Jun 2022

    111
    A student in the laboratory measures thickness of a wire using screw gauge. The readings are 1.22 mm,1.23 mm,1.19 mmmm,1.23\text{ }mm,1.19\text{ }mm and 1.20 mm1.20\text{ }mm. The percentage error is x121%\frac{x}{121}\%. The value of xx is

  2. Question 2

    23 Jan 2026 S1

    4
    Four persons measure the length of a rod as 20.00 cm,19.75 cm,17.01 cm20.00\text{ }cm,19.75\text{ }cm,17.01\text{ }cm and 18.25 cm . The relative error in the measurement of average length of the rod is :

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