2.為了解某種產(chǎn)品的質(zhì)量,從一大批產(chǎn)品中抽出若干批進(jìn)行質(zhì)量檢查,結(jié)果如表:
抽取個(gè)數(shù)n |
50 |
100 |
200 |
500 |
1000 |
2000 |
優(yōu)等品數(shù)m |
45 |
92 |
194 |
470 |
954 |
1902 |
優(yōu)等品頻率 |
|
|
|
|
|
|
(1)計(jì)算各批產(chǎn)品中優(yōu)等品的頻率,把上表補(bǔ)充完整;
(2)從這一大批產(chǎn)品中隨機(jī)抽取1個(gè),則抽到優(yōu)等品的概率約是多少?