WGU C955 Applied Probability and Statistics - ULTIMATE MASTER BANK (350 Q&A) – Full Study Guide: Regression, Probability & Z-Scores ()

2026 UPDATED QUESTIONS DOWNLOAD


WGU C955 Applied Probability and Statistics - ULTIMATE MASTER BANK (400 Q&A) –
Full Study Guide: Regression, Probability & Z-Scores (2025-2026)


This 400-question master bank is the most comprehensive resource available for WGU C955.
It covers all critical domains: Descriptive Statistics, Probability, Correlation and
Regression, and Sampling/Study Design. Each question includes a detailed italicized
rationale explaining the statistical logic. Perfect for passing the Objective Assessment (OA) on
your first attempt!


What is the probability of a certain event?
A. 0
B. 0.5
C. 1
D. Undefined

Correct Answer: C
Rationale: A certain event always occurs, so its probability is 1.


Question 2

Which is a discrete variable?
A. Height
B. Weight
C. Number of students
D. Temperature

Correct Answer: C
Rationale: Discrete variables count whole values.


Question 3

Mean represents:
A. Spread
B. Center
C. Frequency
D. Shape

Correct Answer: B
Rationale: Mean is a measure of central tendency.


Question 4

Median is:
A. Most frequent

, 2026 UPDATED QUESTIONS DOWNLOAD

B. Middle value
C. Average
D. Range

Correct Answer: B
Rationale: Median is the middle value in ordered data.


Question 5

Mode is:
A. Average
B. Most frequent value
C. Middle value
D. Spread

Correct Answer: B
Rationale: Mode is the value that appears most often.


Question 6

Standard deviation measures:
A. Center
B. Spread
C. Count
D. Probability

Correct Answer: B
Rationale: It shows how spread out data is.


Question 7

Range equals:
A. Mean – median
B. Max – Min
C. Sum
D. Mode

Correct Answer: B
Rationale: Range measures total spread.


Question 8

Probability values range from:
A. -1 to 1
B. 0 to 1

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C. 0 to 100
D. -∞ to ∞

Correct Answer: B
Rationale: Probability must be between 0 and 1.


Question 9

Independent events:
A. Affect each other
B. Do not affect each other
C. Always equal
D. Always exclusive

Correct Answer: B
Rationale: One event does not change the probability of another.


Question 10

Complement rule:
A. P(A)+P(B)=1
B. P(A)+P(A')=1
C. P(A)=P(B)
D. P(A)-P(B)=1

Correct Answer: B
Rationale: Event and its complement sum to 1.


Question 11

Normal distribution is:
A. Skewed
B. Uniform
C. Bell-shaped
D. Random

Correct Answer: C
Rationale: It is symmetric and bell-shaped.


Question 12

Z-score measures:
A. Mean
B. Distance from mean in SD
C. Range
D. Frequency

, 2026 UPDATED QUESTIONS DOWNLOAD

Correct Answer: B
Rationale: Z-score standardizes values.


Question 13

Variance is:
A. Square of SD
B. Mean
C. Range
D. Median

Correct Answer: A
Rationale: Variance = SD².


Question 14

Sample is:
A. Entire population
B. Subset
C. Variable
D. Statistic

Correct Answer: B
Rationale: A sample represents part of a population.


Question 15

Population is:
A. Subset
B. Entire group
C. Variable
D. Data point

Correct Answer: B
Rationale: Population includes all elements.


Question 16

Histogram is used for:
A. Categorical data
B. Continuous data
C. Text
D. Codes

Correct Answer: B
Rationale: Histograms display continuous data.