Kognity IB Physics A.0 Measurements & Uncertainty (id: 87ba97ed9)

[单选题]
A student measures a,uvnr;-i ldhb4b- 30o*8uy ah;vrs nr q/we1; oumo9wo )0keu distance four times. The readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is the best estimate of this euuko0ewo 1wq /; )9ommeasurement?

A. $37.8 \pm 0.2 \; cm$
B. $37.8 \pm 0.4 \; cm$
C. $38.0 \pm 0.2 \; cm$
D. $38.2 \pm 0.4 \; cm$


参考答案:  C


本题详细解析:
The mean of the meastmo: )3i90nh 0c ktvodurements is 38.0 cm. The extremes (37.8 cm and 38.2 cm) are both 0.2 cm away from the mean.:md)t9to30o cvk n0 ih So C is the correct answer.