H2P-198

Combining uncertainties

H2 Physics · JC 1 · Hard · Combining uncertainties

A student measures the internal diameter

d_1 = (24.0 \pm 0.2)\text{ mm}

and external diameter

d_2 = (30.0 \pm 0.2)\text{ mm}

of a hollow tube. The wall thickness is taken as

(d_2 - d_1)/2

. What is the percentage uncertainty in the wall thickness?

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