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anonymous
 one year ago
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
anonymous
 one year ago
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

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jackthegreatest
 one year ago
Best ResponseYou've already chosen the best response.0there r 7 marbles in all, 5 r blue

jackthegreatest
 one year ago
Best ResponseYou've already chosen the best response.0so 5/7 is 0.71428571428

triciaal
 one year ago
Best ResponseYou've already chosen the best response.0dw:1442628989097:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0dan do you have i thought on this???????

dan815
 one year ago
Best ResponseYou've already chosen the best response.0chance of red = 100%  chance of no red

triciaal
 one year ago
Best ResponseYou've already chosen the best response.0dw:1442629071301:dw

dan815
 one year ago
Best ResponseYou've already chosen the best response.0no red means both times it was blue that chance both was blue is 5/7*5/7 1(5/7)^2=125/49 = 24/49=approx 0.49

jackthegreatest
 one year ago
Best ResponseYou've already chosen the best response.0shoot i guess i was wrong...

jackthegreatest
 one year ago
Best ResponseYou've already chosen the best response.0i read half the problem

triciaal
 one year ago
Best ResponseYou've already chosen the best response.0@dan815 at least one blue need to include 1 red and 1 blue

dan815
 one year ago
Best ResponseYou've already chosen the best response.0oops i was solving the wrong thing

dan815
 one year ago
Best ResponseYou've already chosen the best response.0chance of blue = 1chance of no red

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.0triciaal 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
 one year ago
Best ResponseYou've already chosen the best response.01(2/7)^2 = 14/49=45/49

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0What's that as a decimal

dan815
 one year ago
Best ResponseYou've already chosen the best response.0use a calculator please

triciaal
 one year ago
Best ResponseYou've already chosen the best response.0dw:1442629431663:dw

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.0use a calculator http://web2.0calc.com/ and type in the fraction to convert to decimal

dan815
 one year ago
Best ResponseYou've already chosen the best response.0you should understand the tree diagram

triciaal
 one year ago
Best ResponseYou've already chosen the best response.0should be same as P(at least 1 blue) = 1 P (all red)

triciaal
 one year ago
Best ResponseYou've already chosen the best response.0dw:1442629747769:dw

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.0yes, `45/49 = 0.918367`
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