plz help me guys....
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(i)Mean refractive index = (1.45+1.44+1.54+1.56+1.54)/5
= 7.53/5
= 1.506
(ii)Mean absolute error = (0.056+0.066+0.034+0.054+0.034)/5
= 0.0488
(iii)Relative error = 0.0488/1.506
= 0.0324
(iv)Percentage error = relative error x 100
= 0.0324 x 100
= 3.24%
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