Need help with this SAT 2 math 2 question. Thanks:)?
2020-07-14 1:03 am
In a certain experiment, there is a 0.2 probability that any thermometer used is in error by more than 1 celcius. If 4 thermometers are used, what is the probability that all of them are in error by more than 1 celcius?
回答 (3)
2020-07-14 1:05 am
✔ 最佳答案
The required probability= 0.2⁴
= 0.0016
2020-07-14 1:08 am
P(all four are wrong) = P(first is wrong) * P(second is wrong) * P(third is wrong) * P(fourth is wrong)
= 0.2 * 0.2 * 0.2 * 0.2
= 0.2^4
= 0.00016 (or 0.016%)
= 0.2 * 0.2 * 0.2 * 0.2
= 0.2^4
= 0.00016 (or 0.016%)
2020-07-14 1:35 am
The thermometers are independent, so you can just multiply the probabilities.
收錄日期: 2021-04-18 18:32:44
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20200713170316AACbhfA