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

[单选题]
A student measures a distance four times. The readg x-ncqky ;ov2x8o, s5n2hid: ings are 37.8 cmo 05ryde crgsx5. y3;o, 37.9 cm, 38.1 cg e 3rr50ycosdxy.; 5om, 38.2 cm. What is the best estimate of this 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 measureme5rt** 4lmw dshnts is 38.0 cm. The extremes (37.8 cm and 38.2 cm) are both 0.2 cm away from the mean. So C is the corredl5rt4wsmh ** ct answer.