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The refractive index of water measured by the relation $\mu$ = (real depth)/(apparent depth) is found to have values of 1.34, 1.38, 1.32 and 1.36; the mean value of refractive index with percentage error is
Explanation
The mean value of refractive index, $\mu = (1.34+1.38+1.32+1.36)/4 = 1.35$ and $\Delta\mu = \frac{|(1.35 - 1.34)| + |(1.35 - 1.38)| + |(1.35 - 1.32)| + |(1.35 - 1.36)|}{4}$ Thus $\Delta\mu/\mu \times 100 = (0.02/1.35) \times 100 = 1.48$