DS 考古form21-sec1-Q9

[jasminelcj]

9. What was the number of defective batteries in a shipment of 4,000 batteries?

(1)In a particular sample of 10 batteries selected from the shipment, 1 was defective.
(2)In a particular sample of 100 batteries selected from the shipment, 3 was defective.

答案:E

我選了D
請問 為什麼不可用個體推母體的機率??然後算出答案??
麻煩解答 謝謝

[65kevin]

9. What was the number of defective batteries in a shipment of 4,000 batteries?

(1)In a particular sample of 10 batteries selected from the shipment, 1 was defective.
(2)In a particular sample of 100 batteries selected from the shipment, 3 was defective.

答案:E

我選了D
請問 為什麼不可用個體推母體的機率??然後算出答案??
麻煩解答 謝謝

我的想法是, 題目中並沒有先告訴你這些電池有瑕疵的比率為何, 而且也未說明瑕疵品的存在是均勻分布, 所以我覺得不能用機率的方法, 提供參考