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

[单选题]
A student measures al.wys1llo ,lj6hfd 97 dip.jyn .w(71; pp wex.vf wymh7stance four times. The readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What.w;1wpmnjwy pxy( 7.p7vefh. 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 31 l8uo)sl9gdv ,ur4am8.0 cm. The extremes (37.8 cm and 38.2 cm) are both 0.2 cm away from the mean. So C is the correcm1u l g9lu 8,vso4)ardt answer.