probability

2013-10-12 7:05 pm
A technician is checking 10 mobile phones. The probability that any mobile phone has problem is 1/4. Find the probability that
(i) none of them has problem
(ii) exactly one of them has problem
(iii) more than one of them have problem

回答 (2)

2013-10-12 11:04 pm
✔ 最佳答案
(i) P(none of them has problem)

= (3/4)^10

= 0.0563

(ii) P(exactly one of them has problem)

= C(10,1) * (1/4) * (3/4)^9

= 0.1877

(iii) P(more than one of them have problem)

= 1 - P(none of them has problem) - P(exactly one of them has problem)

= 1 - 0.0563 - 0.1877

= 0.756
2013-10-14 12:14 pm
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收錄日期: 2021-04-27 19:50:14
原文連結 [永久失效]:
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