In an experiment refractive index of glass was \( \mathrm{P} \) obs...

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In an experiment refractive index of glass was
\( \mathrm{P} \)
observed to be 1.45, 1.56, 1.54, 1.44, 1.54 and 1.53.
W
The mean absolute in the experiment is
(1) 0.04
(2) \( \quad 0.02 \)
(3) -0.03
(4) \pm 0.01
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