Finding permability of free space from Magnetic Field vs. Current graph

[BrownPrincezz]

I graphed Magnetic Field (T) vs Current (A) and my slope was equal to 0.0012 which is off by 10^-3. Can someone suggest why this could be happening?

 

[rock.freak667]

What data did you use to plot the graph?

 

[BrownPrincezz]

What data did you use to plot the graph?

I used the Magnetic field data in Gauss (I did convert it) and Current in Amperes

http://i41.tinypic.com/auic6o.jpg this is what it looks like

 

[BrownPrincezz]

Current (A)
0.1
0.175
0.25
0.325
0.4
0.475
0.55
0.625
0.7
0.775
0.85
0.925
1
Magnetic field (G)
0
0.8
1.7
2.6
3.5
4.3
5.3
6.1
7
7.8
8.8
9.6
10.6