Measurement and Instrumentation
The total current I = I1 + I2 in a circuit is measured as I1 = 150 ± 1A , I2 = 250 ± 2A, where the limits of error are as standard deviations. I is measured as

 (400 ± 1.5) A
 (400 ± 3) A
 (400 ± 1) A
 (400 ± 2.24) A

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