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

[单选题]
A student measures a distance four times. Th yv228vgu9/+f b9eeo m tqhth4e readings are 37.8 cm, 37.9 cm, 3y8la d, 1 8kcuann07yq8.1 cm, 38.2 cm. What is the best el8kc n yd y,na1q8u70astimate 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 cm and 3ut4w*n ;jmnn6s61cpk ) fs4r t8.2 cm) are both 0.2 cm away from the mean. So C is the correcttsnmwrck1 pt46*; funs4n)6 j answer.