anonymous
  • anonymous
A bag contains two red marble and five blue marbles. You draw a marble, record it's color, replace it, and then drawl a second marble. What is the probability that you will draw a blue marble at least once? A) 0.28 B) 0.49 C) 0.71 D) 0.92 @CollateralDamage @dan815
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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jackthegreatest
  • jackthegreatest
i say c
jackthegreatest
  • jackthegreatest
there r 7 marbles in all, 5 r blue
jackthegreatest
  • jackthegreatest
so 5/7 is 0.71428571428

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More answers

jackthegreatest
  • jackthegreatest
@tyann1098
triciaal
  • triciaal
|dw:1442628989097:dw|
anonymous
  • anonymous
dan do you have i thought on this???????
dan815
  • dan815
chance of red = 100% - chance of no red
triciaal
  • triciaal
|dw:1442629071301:dw|
dan815
  • dan815
no red means both times it was blue that chance both was blue is 5/7*5/7 1-(5/7)^2=1-25/49 = 24/49=approx 0.49
jackthegreatest
  • jackthegreatest
shoot i guess i was wrong...
jackthegreatest
  • jackthegreatest
i read half the problem
triciaal
  • triciaal
@dan815 at least one blue need to include 1 red and 1 blue
anonymous
  • anonymous
Thanks guys
dan815
  • dan815
oops i was solving the wrong thing
dan815
  • dan815
chance of blue = 1-chance of no red
anonymous
  • anonymous
So is 0.49 wrong
jim_thompson5910
  • jim_thompson5910
triciaal has the right idea using a tree like that and dan815's expression should be `1-(2/7)^2` which leads to the same answer if you used the tree method (add up the probabilities found on each branch)
dan815
  • dan815
1-(2/7)^2 = 1-4/49=45/49
anonymous
  • anonymous
What's that as a decimal
dan815
  • dan815
use a calculator please
triciaal
  • triciaal
|dw:1442629431663:dw|
jim_thompson5910
  • jim_thompson5910
use a calculator http://web2.0calc.com/ and type in the fraction to convert to decimal
dan815
  • dan815
you should understand the tree diagram
anonymous
  • anonymous
So it's 0.92
anonymous
  • anonymous
?????????
triciaal
  • triciaal
should be same as P(at least 1 blue) = 1- P (all red)
anonymous
  • anonymous
@dan815
anonymous
  • anonymous
Am I right
triciaal
  • triciaal
|dw:1442629747769:dw|
jim_thompson5910
  • jim_thompson5910
yes, `45/49 = 0.918367`
triciaal
  • triciaal
yes

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