Draws are made at random with replacement from a box of colored balls with the following compositions:
|
Color
|
Red
|
Blue
|
Green
|
Yellow
|
|
Proportion
|
0.1
|
0.2
|
0.3
|
0.4
|
Write down and justify unsimplified expressions for the probabilities of the following events:
a) Exactly 5 yellow balls appear in 20 draws:
b) Exactly 2 red, 4 blue, 6 green and 8 yellow balls appear in 20 draws:
c) The number of draws required to produce 3 red balls is 25: