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Two students A and B make measurement of...

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?

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