Let there be two events A and B. with probabilities P(A)=x and P(B)=x−0.1 respectively. Knowing that they are independent and that their intersection has probability 0.0336, Determine the value of x.
Question
Answer:
The probability of the intersection of two independent events A and B is given by P(A and B) = P(A) * P(B).
We are given that P(A and B) = 0.0336, P(A) = x, and P(B) = x - 0.1.
Substituting these values into the formula, we get:
0.0336 = x * (x - 0.1)
0.0336 = x^2 - 0.1x
x^2 - 0.1x - 0.0336 = 0
This is a quadratic equation that we can solve using the quadratic formula:
x = (-b ± sqrt(b^2 - 4ac)) / 2a
where a = 1, b = -0.1, and c = -0.0336.
Substituting these values into the formula, we get:
x = (-(-0.1) ± sqrt((-0.1)^2 - 4(1)(-0.0336))) / 2(1)
x = (0.1 ± sqrt(0.0101)) / 2
x = (0.1 ± 0.38) / 2
Solving for x, we get two possible values:
x = 0.48 / 2 = 0.24
x = -0.28 / 2 = -0.14
Since probabilities cannot be negative, we can discard the second solution and conclude that x = 0.24.
Therefore, the value of x is 0.24.
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