抽取的乒乓球数n |
50 |
100 |
200 |
500 |
1000 |
1500 |
2000 |
优等品的频数m |
48 |
95 |
188 |
x |
948 |
1426 |
1898 |
优等品的频率 (精确到0.001) | 0.960 | y | 0.940 | 0.944 | z | 0.951 | 0.949 |