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

1
(400 ± 3) A
2
(400 ± 2.24) A
3
(400 ± 1/5) A
4
(400 ± 1) A

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