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

[单选题]
A student measures a d-zp g7vn fe-, d-ajo*yistance.f(w da o-6wbt four times. The readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 c-(wwa. bd6of tm. 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 measurements is 38.2g/rcv vv pjp1le ngkg7 ,s,+30 cm. The extremes (37.8 cm and 38.2 cm) are both 0.2 cm away from the mean. So C is thje v127r3kp,nc/,v l gps +vgge correct answer.