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

[单选题]
A student measures a dist9/.ef qudy2u xance four times. The readings are 37.8 c .ow( xtg;qyh2m, 37.9 cm, 38.1 cm, 38.2 cm. What is the best estimate of thio2;(tygh.qx ws 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 and 38.2 cm)u5 t;,yfwg) 3q pvn upthp mch:)*8 .g,d:wzun are both 0.2 cm away fromu:, z;tpc.n gu8,*g5dw3f myh w h:))ptvq pun the mean. So C is the correct answer.