Question

Can someone check my answers?

http://prntscr.com/9iatji
http://prntscr.com/9iatmj

Answer 1

@bahrom7893

Answer 2

@nincompoop

Answer 3

@Astrophysics

Answer 4

How many marbles are there in the first bag?

Answer 5

20

Answer 6

Right and how many blue marbles are there

Answer 7

six

Answer 8

\[Probability = \frac{ \text{number of favourable outcomes} }{\text {number of possible outcomes} }\]

Answer 9

\[\frac{ 6 }{ 20 }\] right

Answer 10

Which simplifies to 3/10 good

Answer 11

Ty what about the second one?

Answer 12

How many marbles in total?

Answer 13

15

Answer 14

Ok so this is multiple parts, so what is the probability of picking a red using what we just learnt?

Answer 15

8/75?

Answer 16

Ignore the replacing part, what is the probability of just picking the red marble?

Answer 17

How many red marbles are there

Answer 18

5

Answer 19

So what are the chances out of 15 that we can get red marbles?

Answer 20

It's the same question as we did above look at it for a reference

Answer 21

5/15

Answer 22

Yes, exactly!

Answer 23

So now it asks what the probability is if we replace it, and then pick up another red marble

Answer 24

5/15 * 1/3 = 1/9?

Answer 25

Yes, exactly we multiply the two ratios

Answer 26

5/15*5/15

Answer 27

or 1/3*1/3 :)

Answer 28

Thanks.