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

[单选题]
A student measures a distance four times. The readings7; reqmnk 8w;o are 37.8 cm, :+rc: 9fsedmq37.9 cm, 38.1 cm, 38.2 cm. Wha s:m9c:+dqfe rt 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 measurements is 38.0 cm u 0:dzqsl(w27rsp orq4fjg7 ,. The extremes (37.8 cm and 38.2 cm) are both 0.2 cm away from the mean. So C is the correct anzj0( q s7fl2rg,pus o7d4wq r:swer.