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

[单选题]
A student measures a di1ozut; 6 )l,pvpdgl1zstance0 hkdmiam3+x1b7p / uv four times. The readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is the bestdb17x/hum kvm3pa i0+ 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.hzcne6 5 o2va88 cm and 38.2 cm) are both 0.2 cm away from the mean. So C ise6ha2o nzc8v5 the correct answer.