Form 2 Maths what is lower limit and upper limit?

lower limit---下限
upper limit---上限
e.g. 1425cm
上限=142+5=147cm
下限=142-5=137cm

upper limit -(一個數值的最大可能值)上限
lower limit -(一個數值的最小可能值)下限

1a. The upper limit of length= 47 + (1/2)

= 47.5 (cm)

The lower limit of length= 47-0.5

=46.5 (cm)

1b. The upper limit of width= 9.8 + (0.1/2)

= 9.85 (cm)

The lower limit of length= 9.8-0.05

=9.75 (cm)

1c. The upper limit of area= 47.5 X 9.85

=467.875 (cm^2)

The lower limit of area= 46.5 X 9.75

= 453.375 (cm^2)

2. The maximum absolute error of the time used

= 160 X 0.3125%

= 0.5 (s.)

The upper limit = 160 +0.5

= 160.5 (s.)

The lower limit = 160 -0.5

= 159.5 (s.)