Question 10 of 20
1.0/ 1.0 Points

A company wants to evaluate its attrition rate, in other words, how long new hires stay with the
company. Over the years, they have established the following probability distribution.
Let
X
= the number of years a new hire will stay with the company.
Let
P
(
x
) = the probability that a new hire will stay with the company x years.
1.
Complete Table using the data provided.
x
P
(
x
)
0
0.12
1
0.18
2
0.30
3
0.15
4
0.10
5
0.10
6
0.05

Question 11 of 20
1.0/ 1.0 Points
Let X be the number of courses taken by a part-time student at a college. The following table
shows the probability distribution of X with probability as a percentage.
Number of
Courses ,
x
1
2
Probability,
P
(
X
=
x
)
52% 28% 20%
What is the probability that a randomly selected part-time student at this college takes at least 2
courses? (That is, find P(X
≥
2)
3

Answer Key:0.48|.48
Feedback:
Greater than or equal to 2 is 2 AND 3. P(x =2) + P(x = 3)
.28 + .20
Question 12 of 20
1.0/ 1.0 Points
Does the following table represent a valid discrete probability distribution?
x
1
2
3
4
5
P
(
X
=
x
)
0.16 0.11 0.06 - 0.36 0.21