Given X = 
. The percent error in measurement of a, b and p is 1%, 0.5% and 0.75% respectively. If n = 2, m = 2 and r = 4 then percent error in x is –
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Ans. 6%
Sol. 
× 100 = 
× 100
= 2 × 1 + 2(0.5) + 4(0.75) = 6%
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