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

[单选题]
A student measures a distance four times. The readings ar *3p9 ghqie+ra d2 euwi,onv--e 37.8(d.v4w2fh9 mghu akk7 cm, 37.9 cm, 38.1 c( 2fhmwk4h7.uv9kdga m, 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 (37.8 cla -3o sih 51r8f6 e;dtgji8cym and 38.2 cm) are both 0.2 cm away from the mean. So C is the correct anig5st6-;ridhao j3flcey881 swer.