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

[单选题]
A student measures a distance four times. The r.iqcsquoj)24)wx9fe z() xfw eadings are 37.8m-say4vd1 (jq cm, 37.9 cm, 38.1 cm, 38.2 cm. What is the bea vj(s4y 1-dmqst 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. The extremes (37.8 cm 8.b)ohfgvpz 6 e*4djpand 38.2 cm) are both 0.2 cm away fo6g f)4.8jh*ezvp dbp rom the mean. So C is the correct answer.