SOLUTION: Assume that an event A contains 10 observations and event B contains 15 observations. If the intersection of events A and B contains exactly 3 observations, how many observations a

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Question 472828: Assume that an event A contains 10 observations and event B contains 15 observations. If the intersection of events A and B contains exactly 3 observations, how many observations are in the union of these two events? A. 0 B. 10 C. 22 D. 28
Found 2 solutions by sudhanshu_kmr, ewatrrr:
Answer by sudhanshu_kmr(1152) About Me  (Show Source):
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

event A contains 10 observations and event B contains 15 observations.

intersection of events A and B contains exactly 3 

how many observations are in the union of these two events:

 P(A ∪ B) = P(A) + P(B) - P(A ∩ B)  = 10 + 15 - 3 = 22