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

[单选题]
A student measures a distance four times. The readingswomkqiso,vi-l wn .2 :iu27b- are 373 fjbkj +x xgx(d4x4yd/q0dr ..8 cm, 37.9 cm, 38.1 cgx rx dddyx/f(0 +q 3j44b.jxkm, 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. The extremes-4bi1.:hfj paoii/ue (37.8 cm and 38.2 cm) are botib- f:oi4pe/.a1 iu jhh 0.2 cm away from the mean. So C is the correct answer.