1. A fair dice is thrown twice. Find the probabilities that the sum of two numbers is greater than 9 given that at least one '6' is obtained.
Is the answer be 5/11 ? if not, can you teach me?
2. A fair dice is thrown twice. Find the probabilities that at least one '6' is obtained given that the sum of two numbers is greater than 9.
Is the answer be 5/6 ? if not, can you teach me?
3. John either takes train or a bus to school. He has a probability of 0.7 of taking train. The probabilities of being late if he takes train and a bus are 0.2 and 0.4 respectively. Find the probability that he is not late on a school day.
I can't think of the solution. Can you teach me??
Thank you !!
解答 0
eric
2020-03-13 22:13:24
1. 5/36
eric
2020-03-13 22:16:51
2. Yes
eric
2020-03-13 22:19:01
0.7×0.8+0.3×0.6
eric
2020-03-13 22:21:08
3.
eric 2020-03-13 22:19:01
0.7×0.8+0.3×0.6
student3897
2020-03-13 23:00:23
可唔可以講解下步驟/列式？thank you !
eric 2020-03-13 22:13:24
1. 5/36
student3897
2020-03-13 23:04:07
想問下點解係0.7×0.8同埋0.3×0.6？知道0.8, 0.6分別係prob. of not being late. 想知道點解係相乘。thank you !!
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