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

[单选题]
A student measures a distance four times. prs z wsiwk8,z7/cx)4 jd-xjxccq7y4,. j4tm The readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is the best estimate of this meas-4t d4xjc jq xy,j7.cmurement?

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 anz dp 9q:l;j -a8b*au2 p6e6kh5oa hvxbd 38.2 cm) are both 0.2 cm away from the mean. So C is thq:h6b xv;abdj6z89l2 e a -upk*paoh5e correct answer.