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STATISTICS OA EXAM FULLY REVISED EXAM
QUESTIONS AND CORRECT DETAILED ANSWERS
MOST RECENT UPDATED 2026-2027 (100%
CORRECT VERIFIED ANSWERS) WGU C784 EXAM
2026 ALREADY GRADED A+
Question 1: Given the following set of numbers: 16, -15.7, 9, -4, 3.14, what is
the sum of the integers?
A. 8.44
B. 28.14
C. 25
D. 21
Answer: D.
The integers in the set are 16, 9, and -4. Adding them together: 16 + 9 + (-4) =
21. The other numbers are not integers because they contain decimals.
Question 2: Which of the following numbers is a rational number?
A. √2
,B. π
C. 0.75
D. √-1
Answer: C.
A rational number is any number that can be expressed as a fraction of two
integers. 0.75 can be written as 3/4. √2 and π are irrational, and √-1 is an
imaginary number.
Question 3: What is the square root of the whole number in the set: 3.3, -2.3, -
16, 25?
A. +/- 2.3
B. +/- 3.3
C. +/- 4
D. +/- 5
Answer: D.
The whole number in the set is 25. The square root of 25 is ±5 because 5 * 5 =
25 and (-5) * (-5) = 25.
Question 4: Evaluate: 8 + (6 - 4) * 3²
A. 14
B. 26
,C. 44
D. 68
Answer: B.
Following the order of operations (PEMDAS), first solve the parentheses: (6-
4)=2. Next, solve the exponent: 3²=9. Then, multiply: 2 * 9 = 18. Finally, add:
8 + 18 = 26.
Question 5: When do you flip the direction of an inequality sign?
A. When adding a negative number to both sides
B. When subtracting a positive number from both sides
C. When multiplying or dividing by a negative number
D. When multiplying or dividing by a positive number
Answer: C.
The inequality sign must be reversed whenever you multiply or divide both
sides by a negative number. This is a critical rule in algebra.
Question 6: What is the result of -4 * (-7)?
A. 28
B. -28
C. 11
D. -11
, Answer: A.
Multiplying two negative numbers results in a positive product. The absolute
values 4 and 7 are multiplied to get 28.
Question 7: Convert 0.375 to a simplified fraction.
A. 3/8
B. 3/4
C. 37/100
D. 375/1000
Answer: A.
0.375 is 375/1000. Dividing both numerator and denominator by their
greatest common factor, 125, simplifies the fraction to 3/8.
Question 8: A server has 125 GB of storage. If 0.48 of the storage is used by
system files, how many GB are remaining?
A. 65 GB
B. 77 GB
C. 60 GB
D. 12.5 GB
Answer: A.
STATISTICS OA EXAM FULLY REVISED EXAM
QUESTIONS AND CORRECT DETAILED ANSWERS
MOST RECENT UPDATED 2026-2027 (100%
CORRECT VERIFIED ANSWERS) WGU C784 EXAM
2026 ALREADY GRADED A+
Question 1: Given the following set of numbers: 16, -15.7, 9, -4, 3.14, what is
the sum of the integers?
A. 8.44
B. 28.14
C. 25
D. 21
Answer: D.
The integers in the set are 16, 9, and -4. Adding them together: 16 + 9 + (-4) =
21. The other numbers are not integers because they contain decimals.
Question 2: Which of the following numbers is a rational number?
A. √2
,B. π
C. 0.75
D. √-1
Answer: C.
A rational number is any number that can be expressed as a fraction of two
integers. 0.75 can be written as 3/4. √2 and π are irrational, and √-1 is an
imaginary number.
Question 3: What is the square root of the whole number in the set: 3.3, -2.3, -
16, 25?
A. +/- 2.3
B. +/- 3.3
C. +/- 4
D. +/- 5
Answer: D.
The whole number in the set is 25. The square root of 25 is ±5 because 5 * 5 =
25 and (-5) * (-5) = 25.
Question 4: Evaluate: 8 + (6 - 4) * 3²
A. 14
B. 26
,C. 44
D. 68
Answer: B.
Following the order of operations (PEMDAS), first solve the parentheses: (6-
4)=2. Next, solve the exponent: 3²=9. Then, multiply: 2 * 9 = 18. Finally, add:
8 + 18 = 26.
Question 5: When do you flip the direction of an inequality sign?
A. When adding a negative number to both sides
B. When subtracting a positive number from both sides
C. When multiplying or dividing by a negative number
D. When multiplying or dividing by a positive number
Answer: C.
The inequality sign must be reversed whenever you multiply or divide both
sides by a negative number. This is a critical rule in algebra.
Question 6: What is the result of -4 * (-7)?
A. 28
B. -28
C. 11
D. -11
, Answer: A.
Multiplying two negative numbers results in a positive product. The absolute
values 4 and 7 are multiplied to get 28.
Question 7: Convert 0.375 to a simplified fraction.
A. 3/8
B. 3/4
C. 37/100
D. 375/1000
Answer: A.
0.375 is 375/1000. Dividing both numerator and denominator by their
greatest common factor, 125, simplifies the fraction to 3/8.
Question 8: A server has 125 GB of storage. If 0.48 of the storage is used by
system files, how many GB are remaining?
A. 65 GB
B. 77 GB
C. 60 GB
D. 12.5 GB
Answer: A.
