Grade 12 Data Management: A jar contains six red marbles and four green ones.

[MathGirl123]

A jar contains six red marbles and four green ones. If two marbles are drawn at random from the jar, find the probability of the second marble being red.

 

[Deleted member 4993]

A jar contains six red marbles and four green ones. If two marbles are drawn at random from the jar, find the probability of the second marble being red.

Please share your thoughts/work with us.

 

[Harry_the_cat]

A jar contains six red marbles and four green ones. If two marbles are drawn at random from the jar, find the probability of the second marble being red.

Have you learnt about probability tree diagrams?

 

[Dr.Peterson]

A jar contains six red marbles and four green ones. If two marbles are drawn at random from the jar, find the probability of the second marble being red.

If you haven't read our guidelines yet, please do; they explain why we ask you to show your own thinking (so we can tell what help you need).

Not knowing what techniques you have learned, my inclination would be to express the desired probability as

P(2nd is red) = P(2nd is red | 1st was red) + P(2nd is red | 1st was green).
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Does that give you any ideas?