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

[单选题]
A student measures a distance four tk77*5f,dc vukpj (qsvh;q c1dimes oyt(vh9z)n4 u. The readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is the best estimate of this measure( 4)hvu n9yoztment?

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 38.2 cm) are*t:lg, pwgf33grn p1p both 0.2 cm away ppg1flg:ptg,*r 3wn 3from the mean. So C is the correct answer.