percentage error

A bullet hits an apple at a as red speed of 500 m/s,
and he percentage error is 1 %.
Find the lower limit and the upper limit of the actual speed of the bullet.
最大速度 = 500(1+1%) = 505ms-1
最小速度 = 500(1-1%) = 495ms-1

∵maximum percentage error = maximum absolute error / measured value×100%
∴maximum absolute error = measured value×maximum absolute error

The maximum absolute error
=500×1 %
=5 m/s

upper limit = 500+ 5 = 505m/s
lower limit = 500﹣5 = 495m/s

∴the actual speed of the bullet is between 495m/s and 505m/s

============================================
maximum absoulte error = 最大絕對誤差
maximum percentage error = 最大百分誤差
upper limit = 上限
lower limit = 下限
============================================
upper limit = measured value + maximum absoulte error
lower limit = measured value﹣maximum absoulte error
上限 = 量度值+ 最大絕對誤差
下限 = 量度值﹣最大絕對誤差

嘩! 呢d我都學緊wo
我應該識既呢條
relative error
=500*1%=5
the lower limit
500-5
=495
the upper limit
=500+5
=505