Question

PLEASE HELP
A bag contains 20 marbles of the same size that are blue, green, and red. The probability of picking a blue marble is 20%. The probability of picking a green marble is 50%. Determine the probability of picking a red marble from the bag and then classify the probability of picking a red marble as likely or not likely to occur.

Answer 1

The total probability of picking any marble is 100%

You can only pick blue, green or red marbles. They give you the probability for blue and green so the remaining probability is for red
$$
P_{red}=1-.2-.5=?
$$

Answer 2

Does this make sense?

Answer 3

yes thank you so much @ybarrap

Answer 4

You're welcome.

Answer 5

but what is the answer?

Answer 6

@ybarrap

Answer 7

Just complete the arithmetic above to get your answer. Then answer the question on whether this number you get means "likely" to occur or "unlikely" to occur

Answer 8

so the answer is -0.7?

Answer 9

1-0.2-0.5=0.3

Answer 10

So 30% of drawing a Red marble

Answer 11

oh okay so it is unlikly?

Answer 12

Given that there is a 50% chance of drawing a Green and 20% for drawing a blue, how likely is it that when you draw a marble you will get a Red?

Green more likely than Red
Red more likely than Blue
Blue is least likely

What do you think? Are you likely to draw a Red marble when the chance of getting some other color is 0.2+0.5=0.7 or 70%?

Answer 13

If I told you that a team had a 30% chance of winning, do you think that team will win?

If I told you that a team had a 70% chance of losing, do you think that team will lose?

Answer 14

it is likely?

Answer 15

There is a 30% chance of drawing a Red.

If I told you that your chance of winning is 30%, do you think you will likely win?

Answer 16

The chance of drawing a color other than Red is 70%.

If I told you that you had a 70% chance of losing, are you likely to lose?

Answer 17

no it is unlikely because there are not a big chance to draw red

Answer 18

That's right!

Say this was for $1 million dollars and you had to bet on Red or some other color.

You have a 70% chance of winning if you pick something other than Red.

On the other hand, you have only 30% chance of winning if you chose Red.

Answer 19

thank you so much

Answer 20

You're welcome - don't let numbers scare you :)