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

[单选题]
A student measures a distance four tim hcl-gl y0 :78ftrim4tgs j6+res. The ,g iip+h8z hw1readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is the best estimate of this measurw h1ihi, p+8gzement?

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 /dr90clj3+*h z nb usxww-yl.cm. The extremes (37.8 cm and 38.2 cm) are both 0.2 cm away from the mean. So C is thednbwlw0xzr9y3c/* s . ujl+- h correct answer.