anonymous
  • anonymous
Hello! I am having trouble with these probability questions, please help me! 1. A standard cubical die is thrown. Calculate the probability that: (a) the same number is thrown twice (b) the two numbers thrown are different 2 A bag consists of 12 coloured balls. Five of the balls are red and the rest of blue. A ball is drawn at random from the bag. It is then replaced and a second ball is drawn. The colour of each ball is recorded. (a) List the possible outcomes of this experiment (I did this no problem) (b) Calculate the probability that: (i) The first ball is blue -to be continued-
Mathematics
  • Stacey Warren - Expert brainly.com
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katieb
  • katieb
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anonymous
  • anonymous
-continuing- (ii) The second ball is red (iii) The first ball is blue and the second ball is red (iv) The two balls are the same colour (v) The two balls are a different colour (vi) Neither ball is red (vii) At least one ball is red
anonymous
  • anonymous
Sorry for so many questions, the only reason I am asking for help with so many is because I have tried them already and, well I got them all wrong
anonymous
  • anonymous
I have learnt about how to multiply probability together for independent events and add together for mutually exclusive ones but I am not sure what determines which method to use

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ganeshie8
  • ganeshie8
Please post one question per thread
anonymous
  • anonymous
OK sorry, should I start a new one?
ganeshie8
  • ganeshie8
Yes that would be great
anonymous
  • anonymous
Ok
jim_thompson5910
  • jim_thompson5910
I agree with @ganeshie8 it's best to have one problem per post. Anyways, here is how to do part (a) -------------------------------------------------------- 1. A standard cubical die is thrown. Calculate the probability that: (a) the same number is thrown twice -------------------------------------------------------- There are 6 outcomes for any die roll since there are 6 sides (1,2,3,4,5,6) If you roll say a 3, then there is a 1/6 chance that you'll roll a 3 again. Why 1/6? Because there are 6 outcomes possible and there's only one outcome we want, which is 3. This can be generalized for any outcome (and not just 3) So the answer to `1(a) ` is 1/6

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