抽取的乒乓球數(shù)n |
200 |
400 |
600 |
800 |
1000 |
1600 |
2000 |
優(yōu)等品的頻數(shù)m |
190 |
384 |
570 |
756 |
955 |
1520 |
1900 |
優(yōu)等品的頻率 |
a |
0.96 |
0.95 |
0.945 |
b |
0.95 |
c |
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