This attempt took 84 minutes.
Question 1
pts
You may find the following files helpful throughout the exam:
Statistics_Equation_Sheet
(Links to an external site.)
Standard Normal Table
(Links to an external site.)
In a large shipment of clocks, it has been discovered that 15 % of
the clocks are defective. Suppose that you choose 9 clocks at
random. What is the probability exactly 2 of the clocks are
defective.
Your Answer:
n=9 x=2 p=.15
f(x)=
n
!
x
!
(
n
−
x
)
!
px(1-p)(n-x) = 9!/2!(9-2)! multiply .152(1-.15)(9-2) =.2597
, Question 2
pts
You may find the following files helpful throughout the exam:
Statistics_Equation_Sheet
(Links to an external site.)
Standard Normal Table
(Links to an external site.)
Find each of the following probabilities:
a. Find P(Z ≤ .17).
b. Find P(Z ≥ -.34) .
c. Find P(-1.14 ≤ Z ≤ 0.55).
Your Answer:
a)P(Z
≤
.17)= .56749
b)P(Z
≥
-.34) =1.00-P(Z
≤
-.34)=1.00-.36693= .63307
c) P(-1.14
≤
Question 1
pts
You may find the following files helpful throughout the exam:
Statistics_Equation_Sheet
(Links to an external site.)
Standard Normal Table
(Links to an external site.)
In a large shipment of clocks, it has been discovered that 15 % of
the clocks are defective. Suppose that you choose 9 clocks at
random. What is the probability exactly 2 of the clocks are
defective.
Your Answer:
n=9 x=2 p=.15
f(x)=
n
!
x
!
(
n
−
x
)
!
px(1-p)(n-x) = 9!/2!(9-2)! multiply .152(1-.15)(9-2) =.2597
, Question 2
pts
You may find the following files helpful throughout the exam:
Statistics_Equation_Sheet
(Links to an external site.)
Standard Normal Table
(Links to an external site.)
Find each of the following probabilities:
a. Find P(Z ≤ .17).
b. Find P(Z ≥ -.34) .
c. Find P(-1.14 ≤ Z ≤ 0.55).
Your Answer:
a)P(Z
≤
.17)= .56749
b)P(Z
≥
-.34) =1.00-P(Z
≤
-.34)=1.00-.36693= .63307
c) P(-1.14
≤
