fake7667
28.02.2020 •
Mathematics
In a sample of 400 customers, 140 say that service is poor. You select two customers without replacement to get more information on their satisfaction. What is the probability that both say service is poor?
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Ответ:
= 973 / 7890
Step-by-step explanation:
P (A∩B) = P (A) * P (B║A)
P (A) = 140 / 400
= 7/20
Because it is without replacement this is a conditional probability of an event with respect to another event;
P (B║A) = 139/399
P (A∩B) = 7/20 * 139/399
= 973 / 7890
Ответ:
I do not know