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

[单选题]
A student measures a distance four times. The readings ar;jk/o 6j aakbd9j+2ecs1,da y*yd8cse 37.8e7c4e-axa i 2scsm*9n cm, 37.9 cm, 38.1 cm, 38.2 cm. What is the best estimate of this me24s*n9eacx7ae ci-m s asurement?

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 cm and xebd5y0y3zk ,38.2 cm) are both 0.2 cm away from the mean. So Cy5,0k ye3z bxd is the correct answer.