Answer :
Answer:
P(A or B) = P(A) + P(B) - P(A and B)
0.87 = 0.8 + P(B) - 0.23
0.87 = P(B) + 0.57
P(B) + 0.57 = 0.87
P(B) + 0.57-0.57 = 0.87-0.57
P(B) = 0.3
Answer: 0.3
The value of P(B)= 0.3
What is probability?
It is a branch of mathematics that deals with the occurrence of a random event.
Given:
P(A)=0.8, P(A OR B)=0.87, P(A AND B)=0.23,
Now, using
P(A or B) = P(A) + P(B) - P(A and B)
0.87 = 0.8 + P(B) - 0.23
0.87 = P(B) + 0.57
P(B) + 0.57 = 0.87
P(B) = 0.87-0.57
P(B) = 0.3
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