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

[单选题]
A student measures a distah0o4t3v (:c: xgwebmf5 xrq5fnce 3+t20gyph; t0d simp -sp-tlgfour times. The readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is the besss- dppy-lt tm3g p2+g0th;0it 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 )1 ajh-:qqq ni/g l-ksfp g+lbl6y7v5is 38.0 cm. The extremes (37.8 cm and 38.2 cm) are both 0.2fk q q:1h)sl a7v ybl5q/i--6+ ljgngp cm away from the mean. So C is the correct answer.