WGU C955 APPLIED PROBABILITY AND
STATISTICS OA MASTER TEST BANK
QUESTIONS AND ANSWERS WITH RATIONALES
Master the WGU C955 Applied Probability and Statistics
Objective Assessment (OA) with this premium,
comprehensive question test bank featuring verified correct
answers. Every question is paired with a direct answer and a
detailed, bolded rationale to ensure a deep understanding of
core competencies like descriptive statistics, probability
rules, data displays, and linear algebra. Perfect for last-
minute cramming or systematic module review, this exam
prep guide mirrors the actual test format to help you pass
your assessment on the first attempt.
Module 1: Number Sense & Basic Operations
Question 1
A researcher needs to classify a dataset consisting of whole
numbers, their negatives, and zero. Which classification of
numbers perfectly describes this set?
A) Whole numbers
B) Natural numbers
C) Integers
D) Irrational numbers
Correct Answer: C
,Rationale: Integers encompass all positive and negative
whole numbers, as well as zero. Whole numbers do not
include negatives, and natural numbers exclude both
negative values and zero.
Question 2
Convert the fraction
58five-eighths
58
to its exact decimal and percentage equivalents.
A) 0.58, 58%
B) 0.625, 6.25%
C) 0.625, 62.5%
D) 0.525, 52.5%
Correct Answer: C
Rationale: Dividing 5 by 8 yields 0.625. To convert a decimal
to a percentage, you multiply by 100 and add the percentage
symbol, which gives 62.5%.
Question 3
Simplify the fraction
8412684 over 126 end-fraction
84126
to its lowest terms.
A)
,23two-thirds
23
B)
46four-sixths
46
C)
7127 over 12 end-fraction
712
D)
142114 over 21 end-fraction
1421
Correct Answer: A
Rationale: The greatest common divisor (GCD) for both 84
and 126 is 42. Dividing both the numerator and the
denominator by 42 simplifies the expression directly to
23two-thirds
, 𝟐𝟑
.
Question 4
Evaluate the expression following the proper order of operations
(PEMDAS): 12 + 6 × (3 - 1)² ÷ 2.
A) 36
B) 24
C) 18
D) 48
Correct Answer: B
Rationale: First, address the parentheses: (3 - 1) = 2. Next,
calculate the exponent: 2² = 4. Then, perform multiplication
and division from left to right: 6 × 4 = 24, and 24 ÷ 2 = 12.
Finally, perform addition: 12 + 12 = 24.
Question 5
Which mathematical property is explicitly shown by the equation a
+ (b + c) = (a + b) + c?
A) Commutative Property of Addition
B) Distributive Property
C) Identity Property of Addition
D) Associative Property of Addition
Correct Answer: D
Rationale: The associative property states that when adding
three or more numbers, the grouping (placement of
parentheses) does not change the final sum.
Module 2: Data Types, Sampling, and Design
STATISTICS OA MASTER TEST BANK
QUESTIONS AND ANSWERS WITH RATIONALES
Master the WGU C955 Applied Probability and Statistics
Objective Assessment (OA) with this premium,
comprehensive question test bank featuring verified correct
answers. Every question is paired with a direct answer and a
detailed, bolded rationale to ensure a deep understanding of
core competencies like descriptive statistics, probability
rules, data displays, and linear algebra. Perfect for last-
minute cramming or systematic module review, this exam
prep guide mirrors the actual test format to help you pass
your assessment on the first attempt.
Module 1: Number Sense & Basic Operations
Question 1
A researcher needs to classify a dataset consisting of whole
numbers, their negatives, and zero. Which classification of
numbers perfectly describes this set?
A) Whole numbers
B) Natural numbers
C) Integers
D) Irrational numbers
Correct Answer: C
,Rationale: Integers encompass all positive and negative
whole numbers, as well as zero. Whole numbers do not
include negatives, and natural numbers exclude both
negative values and zero.
Question 2
Convert the fraction
58five-eighths
58
to its exact decimal and percentage equivalents.
A) 0.58, 58%
B) 0.625, 6.25%
C) 0.625, 62.5%
D) 0.525, 52.5%
Correct Answer: C
Rationale: Dividing 5 by 8 yields 0.625. To convert a decimal
to a percentage, you multiply by 100 and add the percentage
symbol, which gives 62.5%.
Question 3
Simplify the fraction
8412684 over 126 end-fraction
84126
to its lowest terms.
A)
,23two-thirds
23
B)
46four-sixths
46
C)
7127 over 12 end-fraction
712
D)
142114 over 21 end-fraction
1421
Correct Answer: A
Rationale: The greatest common divisor (GCD) for both 84
and 126 is 42. Dividing both the numerator and the
denominator by 42 simplifies the expression directly to
23two-thirds
, 𝟐𝟑
.
Question 4
Evaluate the expression following the proper order of operations
(PEMDAS): 12 + 6 × (3 - 1)² ÷ 2.
A) 36
B) 24
C) 18
D) 48
Correct Answer: B
Rationale: First, address the parentheses: (3 - 1) = 2. Next,
calculate the exponent: 2² = 4. Then, perform multiplication
and division from left to right: 6 × 4 = 24, and 24 ÷ 2 = 12.
Finally, perform addition: 12 + 12 = 24.
Question 5
Which mathematical property is explicitly shown by the equation a
+ (b + c) = (a + b) + c?
A) Commutative Property of Addition
B) Distributive Property
C) Identity Property of Addition
D) Associative Property of Addition
Correct Answer: D
Rationale: The associative property states that when adding
three or more numbers, the grouping (placement of
parentheses) does not change the final sum.
Module 2: Data Types, Sampling, and Design
