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Tue 10 May, 2016 08:21 am
Dependent probability:
A bag has 2 red marbles, 3 green marbles, and 1 blue marble.
Find the probability of selecting 2 red marbles without replacement.
2/5 x 1/4 = 1/10 = 10%
Find the probability of selecting 3 green marbles without replacement.
3/5 x 2/4 = 3/10 = 30%
Find the probability of selecting 1 blue marble without replacement.
1/5 x 0/4 = 0%
Independent probability:
A piggy bank has 20 coins. There are 10 dimes, 6 pennies, and 4 quarters.
Find the probability of selecting 2 dimes with replacement?
10/20 x 10/20 = 1/4 = 25%
Find the probability of selecting 2 pennies with replacement?
6/20 x 6/20 = 9/100 = 9%
Find the probability of selecting 3 quarters with replacement?
4/20 x 4/20 x 4/20 = 1/125 = 0.8%
@wonderpet,
The bag total starts at 6 not 5, so the first (red pair) probability is 2/6 x 1/5
...etc for the marbles. The rest looks OK.
@fresco,
When you say the probability of selecting the blue marble is zero, does that make sense to you?
@engineer,
True... perhaps my 'etc' should have been more specific and explicit on the marbles Q.
@wonderpet,
I made a lot of mistakes lol fixed them
@wonderpet,
The key point is that you got the basic principles right. Be sure to apply common sense to your answers. I pointed out that 0% because that should have leaped out to you as wrong.
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