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

[单选题]
A student measures a dis.p bauki+sd90kl(d4hw g he8. tanceb ptdqvgo 03s.6ia+s 5 four times. The readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is the best estimate of this measurem6dss+5 a g.o 03ipvtqbent?

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 measur raur2ry,e1z u) i,p zd;l+fx n31gwg5ements is 38.0 cm. The extremes (37.8 cm and 38.2 cm) are both 0.2 cm away from the mean.r1w2) 1gr,urge3iyz+;a,x f5 dzlpnu So C is the correct answer.