本區搜索:
Yahoo!字典
打印

[Core] [十萬火急] Probability 題目一問

[隱藏]

[十萬火急] Probability 題目一問

a)
Concrete blocks are tested and it is found that, on average, 7% fail to meet the required specification. To pick up 9 concrete blocks from a batch of concrete blocks in a construction site, determine the probabilities that less than three blocks out from the chosen 9 concrete blocks will fail to meet the specification.


Let N = no. of concrete blocks that fail from a batch of 9 concrete blocks


P (less than 3 blocks fail)
= P(N=0) + P(N=1) + P(N=2)
= (1-0.07)^9 + (9C1) (1-0.07)^(8) (0.07) + (9C2) (1-0.07)^7(0.07)^2
=0.9791


咁樣岩唔岩? thanks a lot!

[ 本帖最後由 Methodical 於 2016-9-21 03:58 PM 編輯 ]
   

TOP

the answer is correct. Just rmb to specify what distribution are you using in order to get M marks even if your answer is wrong.

***N ~ B( 9, 0.07) ***

TOP

重要聲明:小卒資訊論壇 是一個公開的學術交流及分享平台。 論壇內所有檔案及內容 都只可作學術交流之用,絕不能用商業用途。 所有會員均須對自己所發表的言論而引起的法律責任負責(包括上傳檔案或連結), 本壇並不擔保該等資料之準確性及可靠性,且概不會就因有關資料之任何不確或遺漏而引致之任何損失或 損害承擔任何責任(不論是否與侵權行為、訂立契約或其他方面有關 ) 。