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

[单选题]
A student measures ak faqv*m;v8u ;w( /5m2et gpxw eow 9+rov3m i+distance four times. The readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is the best estimate of themr+i w9o o3+vis measurement?

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 measurements is 38.0 cm. The extremes (37.8 cmdkl*tyc ,+mts6 w5s3tzf4xb + and 38.2 cm) are both 0.2 cm away from the mean. So C is the correctd+f tl6w+ tc msb*z43sxty5 k, answer.