In an experiment, the refractive index of water was found to be 1.35, 1.29, 1.32 and 1.36. What is the average refractive index of water?

Correct option is B

Given:

Refractive indices from the experiment:
1.35, 1.29, 1.32, 1.36

Formula Used:

Average = $$\frac{\text{Sum of observations}}{\text{Number of observations}}$$​​

Solution:

Sum = 1.35 + 1.29 + 1.32 + 1.36 = 5.32

Number of observations = 4

Average = $$\frac{5.32}{4}$$​ = 1.33