# probability

• Dec 9th 2008, 04:11 AM
Zandra
probability
A police department needs new tires for its patrol cars. the probabilities that it will be any brands A,B,C or D are 0.24, 0.18, 0.28 & 0.30 resply. find the probability that it will be any of the brands A or C
• Dec 9th 2008, 11:44 AM
chabmgph
Quote:

Originally Posted by Zandra
A police department needs new tires for its patrol cars. the probabilities that it will be any brands A,B,C or D are 0.24, 0.18, 0.28 & 0.30 resply. find the probability that it will be any of the brands A or C

Hi Zandra,

You can use the following to figure it out:
$\displaystyle Pr(A \text{ or } B)=Pr(A)+Pr(B)-Pr(A \text{ and } B)$
• Dec 15th 2008, 02:34 AM
mr fantastic
Quote:

Originally Posted by Zandra
A police department needs new tires for its patrol cars. the probabilities that it will be any brands A,B,C or D are 0.24, 0.18, 0.28 & 0.30 resply. find the probability that it will be any of the brands A or C

0.24 + 0.28 = ....
• Dec 15th 2008, 02:47 AM
ice_syncer
Quote:

Originally Posted by Zandra
A police department needs new tires for its patrol cars. the probabilities that it will be any brands A,B,C or D are 0.24, 0.18, 0.28 & 0.30 resply. find the probability that it will be any of the brands A or C

Just add the probablility of C and A

That is 0.28+0.24
• Dec 16th 2008, 08:46 PM
Zandra
THANKYOU
• Dec 17th 2008, 05:06 AM
ice_syncer
You may press the thanks button.