6.
A bin contains 20 machine parts among which 5 are defective. Four parts are
randomly drawn from the bin one after the other without replacement.
a. What is the probability of getting all non defective parts?
(2pts)
20-5=15
15.
14
13
12
=0.2817
20
61
18
17
b. What is the probability of getting all defective parts?
5
3
- '
.
20
.
2
118 17
=10.00103
c. What is the probability of getting exactly one defective part?
(2pts)
(4pts)
15.14.13. 5
=
20 1 18
17
d. What is the probability of getting at least one defective part?
(2pts)
e. Are the drawings dependent or independent? Justify.
(2pts)
