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

[单选题]
A student measures a distancyxa,wkf xu;8h7ccv.0sp6h 3 p e four ti qqpyy881eej8z+ctam5)9xrt x 7t0fn mes. The readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What iyx8c7tqerq at59et)z8mn1 8yj p x0+fs 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 meas6tg:) iuwbc2vh2 : lmrurements is 38.0 cm. The extremes (37.8 cm and 38.2 cm) are both 0.2 cm away from the mean. So C ilt2mv:ui 6rgcw h: 2)bs the correct answer.