Two students A and B make measurement of the focal length of the same lens
Readings of A : `16.35, 16.30, 16.27, 16.35, 16.50, 16.25, 16.30, 16.50, 16.20,` and `16.40` cm.
Reading of B : `15.83, 16.38, 15.88, 16.22, 16.30, 16.43, 16.00, 15.80, 16.40,` and `16.30`.
Whose measurements are move reliable and why?

Answer

S.D. of `A=0.100"and "S.D. "of" B=0.250`. Hence readings of A are move reliable than that of B