X and Y are two events The probability of X or ... - JAMB Mathematics 2000 Question
X and Y are two events. The probability of X or Y is 0.7 and that of X is 0.4. If X and Y are independent, find the probability of Y.
A
0.30
B
0.50
C
0.57
D
1.80
correct option: a
P (X or Y) = P(X) + P(Y), when they are independent as given.
0.7 = 0.4 + P(Y)
P(Y) = 0.7 - 0.4 = 0.30
0.7 = 0.4 + P(Y)
P(Y) = 0.7 - 0.4 = 0.30
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