# Upper and Lower Bounds?

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#1

1) 30cm to 2s.f. Upper=30.5 Lower=29.5

2)18cm to 2s.f. Upper=18.5 Lower=17.5

3)645 to 5mm Upper=645.5 Lower=644.5

4)400 to 5mm Upper=400.5 Lower=399.5

5)163 to 3s.f. Upper=163.5 Lower=162.5

6)45.3 to 3s.f. Upper=45.35 Lower=45.25

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#2
(Original post by AlphaNick)
3) 640 or 650
4) 395 or 405

rest are fine
How come? I thought you have to + or -half of the value you've got, so for 645 to the nearest 5mm, wouldn't it be 645 +or- 2.5?
0
7 years ago
#3
(Original post by Qaiys)

1) 30cm to 2s.f. Upper=30.5 Lower=29.5

2)18cm to 2s.f. Upper=18.5 Lower=17.5

3)645 to 5mm Upper=645.5 Lower=644.5

4)400 to 5mm Upper=400.5 Lower=399.5

5)163 to 3s.f. Upper=163.5 Lower=162.5

6)45.3 to 3s.f. Upper=45.35 Lower=45.25

3 and 4 are wrong as you need to go half a unit above and below and half of 5mm is 2.5 mm

So
Q3 is 642.5, 647.5

Can you try Q4
0
7 years ago
#4
(Original post by AlphaNick)
3) 640 or 650
4) 395 or 405

rest are fine
These are incorrect
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#5
(Original post by TenOfThem)
These are incorrect
Thanks! Would 4 be 402.5 and 397.5?
0
7 years ago
#6
(Original post by Qaiys)
Thanks! Would 4 be 402.5 and 397.5?
yes
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#7
(Original post by TenOfThem)
yes
So would 3.47 to 2 d.p. be Upper=3.475 and Lower=3.465?
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7 years ago
#8
(Original post by Qaiys)
So would 3.47 to 2 d.p. be Upper=3.475 and Lower=3.465?
yes
0
#9
(Original post by TenOfThem)
yes
Thanks!
0
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