Friction          
Mass of Block Mb 217 217 217 217 217
Added Mass Mw 0 100 200 400 500
Normal Force/g:                N / g = Mb + Mw 217 317 417 617 717
fs / g =F / g = M 50 67 85 130 150
Coefficient of Static Friction µs=M / (Mb+Mw) 0.2304 0.2114 0.2038 0.2107 0.2092
           
Mass of Block Mb 321 421 521 721 821
Added Mass Mw 0 100 200 400 500
Normal Force/g:                N / g = Mb + Mw 321 521 721 1121 1321
fs / g =F / g = M 60 80 100 130 150
Coefficient of Static Friction µs=M / (Mb+Mw) 0.1869 0.1536 0.1387 0.1160 0.1136
           
Mass of Block Mb 272.3 272.3 272.3 272.3 272.3
Added Mass Mw 0 100 200 400 500
Normal Force/g:                N / g = Mb + Mw 272.3 372.3 472.3 672.3 772.3
fs / g =F / g = M 60 80 100 150 170
Coefficient of Static Friction µs=M / (Mb+Mw) 0.2203 0.2149 0.2117 0.2231 0.2201

You got the Coefficient of Static Friction as below:

0.230415
0.211356
0.203837
0.210697
0.209205
0.186916
0.153551
0.138696
0.115968
0.11355
0.220345
0.21488
0.21173
0.223115
0.220122