anonymous
  • anonymous
Probability question: A bag contains 12 coloured balls. Five of the balls are red and the rest are 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. The first question asks me to list the possible outcomes of the experiment which I did without problems. The next one however, is where I am stuck. (b) Calculate the probability that: (i) The first ball is blue
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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SolomonZelman
  • SolomonZelman
5 - red 12-5=7 blue Ball is randomally drawn twice with replacement.
SolomonZelman
  • SolomonZelman
BR BB RB RR those are possible outcomes, (and would have been even without replacement)
SolomonZelman
  • SolomonZelman
(b) probability of what?

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anonymous
  • anonymous
The probability that the first ball is blue
anonymous
  • anonymous
The answer is given as 7/12 but I don't know how they got there
Zarkon
  • Zarkon
7 blue out of 12balls
anonymous
  • anonymous
Oh...I don't know how I missed that...
anonymous
  • anonymous
Well ok then. Thanks very much.
Zarkon
  • Zarkon
no problem

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