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anonymous
 one year ago
A bag has 1 red marble, 4 blue marbles, and 3 green marbles. Peter draws a marble randomly from the bag, replaces it, and then draws another marble randomly. What is the probability of drawing 2 blue marbles in a row? Explain your answer.
anonymous
 one year ago
A bag has 1 red marble, 4 blue marbles, and 3 green marbles. Peter draws a marble randomly from the bag, replaces it, and then draws another marble randomly. What is the probability of drawing 2 blue marbles in a row? Explain your answer.

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Nnesha
 one year ago
Best ResponseYou've already chosen the best response.0oky so i guess \[\rm \frac{ blue~marbles }{ total ~number~of marbles }\]

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.0ahhh i'm not good 't probability stuff ?/>

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.2@Nnesha you're on the right track

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.2you need to figure out how many blue marbles there are, out of how many total probability of picking blue = (# of blue)/(# total) since replacements are made, this means that the probability does not change on the second draw

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.2probability of picking 2 blue = (probability of picking 1 blue)*(probability of picking 1 blue)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0so im kinda lost...so it would be 2= 1x1?

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.2we have 4 blue out of 8 total so you agree that the probability of picking one blue is 4/8 = 1/2 right?

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.2the probability of picking 2 blue is equal to P(2 blue) = P(1 blue AND 1 blue) P(2 blue) = P(1 blue)*P(1 blue) P(2 blue) = (1/2)*(1/2) P(2 blue) = (1*1)/(2*2) P(2 blue) = 1/4

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.2this rule only works because replacements are made and each drawing is independent

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0OK so what should i write down? @jim_thompson5910

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.2Basically those steps and the answer. But in your own words and format that's unique to you. Hopefully you see how I got that answer?

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.2you're welcome

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.0thanks @jim_thompson5910 o^_^o
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