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

[单选题]
A student measures a distance f*76chluc eyztf 7n /1hour times. T yp;d)3oh+oq+q rco3ln4q- bqhe readings are 37.8 cm, 37.9 cm, 38.14qp oqc; ho3-3dony+lrqq b)+ cm, 38.2 cm. What is the best 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. Thh3j:bsh 7p) u( aqw.sxe extremes (37.8 cm and 38.2 cm) are both 0.2 cm away from thexhbquh ap )3:s 7(j.ws mean. So C is the correct answer.