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The mean length of an object is 5 cm. Which of the following measurements is most accurate?

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The mean length of an object is 5 cm. Which of the following measurements is most accurate?
A. 4.9 cm
B. 4.805 cm
C. 5.25 cm
D. 5.4 cm
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Correct Answer - (a)
Here, x =5 cm
`Deltax_1 =5- 4.9 = 0.1 cm, Delta x_2 =5- 4.805 = 0.195cm`
`Delta x_3 = 5-5.25 = - 0.25 cm, Delta x_4 = 5-5.4 = - 0.4 cm`
Choice (a) is most accurate.
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