Quick math look up tables
I’m writing down these table mostly for my own future quick reference. Feel free to use.
Percentage-to-Fraction look up:
| 1/1 | 100% |
| 1/2 | 50% |
| 1/3 | 33.33% |
| 1/4 | 25% |
| 1/5 | 20% |
| 1/6 | 16.67% |
| 1/7 | 14.3% |
| 1/8 | 12.5% |
| 1/9 | 11.11% |
| 1/10 | 10% |
| 1/11 | 9.1% |
| 1/12 | 8.33% |
| 1/13 | 7.7% |
| 1/14 | 7.14% |
| 1/15 | 6.67% |
| 1/20 | 5% |
Sigma Rule (Normal):
| sigma | probability |
| 0.5 | 38.29% |
| 1 | 68.27% |
| 2 | 95.45% |
| 3 | 99.73% |
| 4 | 99.99% |
| 5 | 99.9999% |
| 6 | 99.9999998% |
| 7 | 99.9999999997% |
| 10 | 100.00% |
In Excel use: =2*NORM.DIST(E2,0,1,TRUE)-1
More to come.