A set of 9 measurements has a mean of 12.436 m and a standard deviation of 1.20 m. How should the mean be written with an uncertainty given by the Standard Error of the Mean (Standard Error)? Select one: (12.43 ± 1.20) m b. (12.436 + 1.2) m O c. (12.4 + 0.4) m d. (12.44 ± 0.40) m e. (12.4 ± 0.40) m

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