Question

LAST QUESTION!!

20. The diagram showed below shows the contents of a jar from which you select marbles at random.

a. What is the probability of selecting a red marble, replacing it, and then selecting a blue marble?
b. What is the probability of selecting a red marble, setting it aside, and then selecting a blue marble?
c. Are the answers to part a and b the same? Why or why not?

Answer 1

@kropot72 can you help me? It's the LAST ONE EVER!!!!!!!! :D

Answer 2

Oh, and can you show the work o:

Answer 3

So I know how you'll get it.

Answer 4

The first step is to find the number of marbles of each color. Can you count them and post your result?

Answer 5

R = 4
B = 7
G = 5
total = 16
select R: p1 = (4/16) select B, p2 = (7/16)
do these jointly: probability P = p1 p2 = (4x7)/16x16)

second question p1 = (4/16) p2 = (7/15) etc.

Answer 6

Blue-7, Red-4, Green-5

Answer 7

X) You beat me

Answer 8

Douglas has given you the methods and the calculations. You will see that the answers to part a and part b are different. The reason for the difference in these answers is that part a is sampling with replacement and part b is sampling without replacement. Notice that the total number of marbles when taking the second sample in part b is only 15, the reason being that the red marble taken in the first sample was not replaced.