Infinite · 2020年02月03日
问题如下：
Based on the probabilities in the diagram below, considering the three distinct pairs of events, how many of these pairs are independent?
选项：
A.0
B.1
C.2
D.3
解释：
We can use the rule that events are independent if their joint probability is the product of the probability of each. Pr(A) = 48%, Pr(B) = 55%, Pr(C) = 53%, Pr(A∩B) = 21% ≠ (48% * 55%), Pr(A∩C) = 25% ≠ (48% * 53%), Pr(B∩C) = 28% ≠ (55% * 53%). None of these events are pairwise independent.
这道题是什么意思？
NO.PZ2020010301000017 问题如下 Baseon the probabilities in the agrbelow, consiring the three stinpairs of events, how many of these pairs are inpennt? A.0 B.1 C.2 3 We cuse the rule thevents are inpennt if their joint probability is the proof the probability of each. Pr(= 48%, Pr(= 55%, Pr(= 53%, Pr(A∩= 21% ≠ (48% * 55%), Pr(A∩= 25% ≠ (48% * 53%), Pr(B∩= 28% ≠ (55% * 53%). None of these events are pairwise inpennt. 这道题可以通过看图、不计算就知道答案吗？
NO.PZ2020010301000017 问题如下 Baseon the probabilities in the agrbelow, consiring the three stinpairs of events, how many of these pairs are inpennt? A.0 B.1 C.2 3 We cuse the rule thevents are inpennt if their joint probability is the proof the probability of each. Pr(= 48%, Pr(= 55%, Pr(= 53%, Pr(A∩= 21% ≠ (48% * 55%), Pr(A∩= 25% ≠ (48% * 53%), Pr(B∩= 28% ≠ (55% * 53%). None of these events are pairwise inpennt. P(AB)和P(A∩B)有区别么
NO.PZ2020010301000017 问题如下 Baseon the probabilities in the agrbelow, consiring the three stinpairs of events, how many of these pairs are inpennt? A.0 B.1 C.2 3 We cuse the rule thevents are inpennt if their joint probability is the proof the probability of each. Pr(= 48%, Pr(= 55%, Pr(= 53%, Pr(A∩= 21% ≠ (48% * 55%), Pr(A∩= 25% ≠ (48% * 53%), Pr(B∩= 28% ≠ (55% * 53%). None of these events are pairwise inpennt. Pr(A∩= 25% ≠ (48% * 53%)？不等于么？48%*53%不是25.44%？题里都没有小数出现，这不能算是25%吗？
