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Uni maths help - statistics watch

1. Hey guys, i have this question to do and cannot figure out how to do part C! Any help's appreciated thanks.

Consider two events A and B. The probability of event A is 0.2, the probability of event A given that event B has occurred is 0.9, and the probability of event B given that event A has occurred is 0.4. Calculate the following probabilities:

a) P(A and B)
b) P(B)
c) P(A or B)

Also part B of this question:

5) A and B are events such that P(A) = 0.6 and P(A or B) = 0.9

a) Find P(B) if A and B are mutually exclusive
b) Find P(B) is A and B are independent
2. (Original post by Majeue)
Hey guys, i have this question to do and cannot figure out how to do part C! Any help's appreciated thanks.

Consider two events A and B. The probability of event A is 0.2, the probability of event A given that event B has occurred is 0.9, and the probability of event B given that event A has occurred is 0.4. Calculate the following probabilities:

a) P(A and B)
b) P(B)
c) P(A or B)
Isn't this AS level maths and not uni, sorry I think you've got this in the wrong topic I'll get a mod to move to a levels!
3. (Original post by Sonnyjimisgod)
Isn't this AS level maths and not uni, sorry I think you've got this in the wrong topic I'll get a mod to move to a levels!
Nope I'm doing this at uni. I don't actually do a maths course but it's uni work..
4. (Original post by Majeue)
...
Both questions can be dealt with using:

P(A or B) = P(A) + P(B) - P(A and B)
5. (Original post by Majeue)
Hey guys, i have this question to do and cannot figure out how to do part C! Any help's appreciated thanks.

Consider two events A and B. The probability of event A is 0.2, the probability of event A given that event B has occurred is 0.9, and the probability of event B given that event A has occurred is 0.4. Calculate the following probabilities:

a) P(A and B)
b) P(B)
c) P(A or B)

Also part B of this question:

5) A and B are events such that P(A) = 0.6 and P(A or B) = 0.9

a) Find P(B) if A and B are mutually exclusive
b) Find P(B) is A and B are independent
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Updated: January 22, 2015
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