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

[单选题]
A student measures a distanw lnmze5oh87k4kpd p0, 1qv g6(f hb7nce four times. The readings are 37.j14 +v c (diclc4hcp9p8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is the best estimate of this measuc4(cvi+cp9ljc p4h1d rement?

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 38.09qy ko2 zvaq1-g;v). ybl csr( cm. The extremes (37.8 cm and 38.2 cm) are both 0.2 cm away from the mean. So C is the correz-qg ka;lovyq(c. 1 2bys9r )vct answer.