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

[单选题]
A student measures a distance four times. T.wstzve0ncwr;c d:7 7he readings are 37pal4a .9iudr gf*q6r( .8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is the best estimate of this measur6q a. d9ipa*(4ulfrr gement?

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 ac ,+/ /aomdwbwnd 38.2 cm) are both 0.2 cm away from the mean. So C is the correcwc/bm /,+oawd t answer.