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WGU C955 Probability and Statistics
Objective Assessment Exam 2023
- What is 3/4 divided by
2/3? A) 9/8
B) 5/12
C) 5/7
D) 6/7: 9/8 - A county park has hiking paths with lengths of 1.05, 3.6, 3.17, and 2.2
miles.
What is the total length, in miles, of hiking paths in the park?
A) 9.02 miles
B) 10.02 miles
C) 10.12 miles
D) 11.2 miles: 10.02 miles - If there are 2 tablespoons in 1 fluid ounce, how many tablespoons does
the following calculation yield?
2 /
4 fl oz – 1.5 tbsp
0.5 tbsp
1 tbsp
2.5 tbsp
6.5 tbsp: 6.5 tbsp
- Solve for X:
X – 5/4 = 2/3
A) 3/12
B) 7/12
C) 10/12
D) 23/12: 23/12 - Solve for
X:
X+5/3=2/3
A) -3
B) -1
C) 1
D) 3: -1 - Given the
inequality: 2y + 6 > 20
Which graph is the
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solution? A) {{ y < 3 }}
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B) {{ y > 6 }}
C) {{ y > 7 }}
D) {{ y < 7 }}: {{ y > 7 }}
- Which graph is the solution for y < 8?
A) {{ unfilled circle on 8, arrow pointing left }}
B) {{ filled circle on 8, arrow point left }}
C) {{ unfilled circle on 8, arrow pointing right }}
D) {{ filled circle on 8, arrow point right }}: {{ unfilled circle on 8, arrow
pointing left }} - Which graph is the solution for 4y – 6 >
18? A) {{ y > 4 }}
B) {{ y > 6 }}
C) {{ y < 4 }} D) {{ y < 6 }}: {{ y > 6 }} - What is the correct line graph for y = 3x +
5? A) (0,5) to (2,11)
B) (0,-5) to (2,-11)
C) (0,3) to (2,5)
D) (0,3) to (2,-7): (0,5) to (2,11)
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WGU C955 Probability and Statistics Pre Assessment Exam 20231. In a class of 25 students, the following test scores were obtained:
31, 46, 49, 52, 55, 67, 68, 68, 69, 69, 71, 73, 73, 75, 75, 78, 79, 82, 84, 84, 85,
87,
91, 92, 97
Which statement is true about this distribution ANS The distribution is
skewed to the left.
- In a class of 25 students, the following test scores were obtained:
51, 59, 59, 59, 67, 68, 68, 69, 69, 71, 73, 73, 75, 75, 78, 79, 82, 84, 85, 85, 87,
91,
92, 93, 93
A histogram of interval width 10 starting with the interval [50, 60] was
constructed using the above data.
Which statement is true about this distribution as depicted by the
his- togram ANS It is a unimodal symmetric distribution.
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- In a class of 25 students, the following scores were received on a
quiz: 3, 3, 3, 3, 4, 4, 4, 4, 4, 5, 5, 6, 6, 6, 7, 7, 8, 8, 8, 8, 8, 9, 9, 9, 9
For this distribution, what is the most appropriate measure of central
tenden- cy ANS Either the mean or the median - The following 5-number summaries were obtained for two
distributions, A and B:
A 3.2 4.9 5.7 5.9 8.2
B 2.7 5.1 5.7 6.9 7.5
The distribution of A is skewed to the right, whereas the distribution of B is
skewed to the left.
How are the means of the two distributions related ANS The mean of A is
higher than the mean of B. - A study is conducted to determine if there is a difference in final exam
scores in high school classrooms when different types of instruction are
used. The two types of instruction included in the study are direct
instruction
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and computer-based instruction.
What are the explanatory (X) and response (Y) variables for this study ANS
The type of instruction is the explanatory variable (X) and the test
score is the response variable (Y).
- A store asked 350 of its customers whether they were satisfied with
their service. The responses were also classified according to the gender
of the customers.
Satisfied Somewhat
Satisfied Not
Satisfied Total
Male 60 60 50 170
Female 45 20 115 180
Total 105 80 165 350
If a person wanted to study whether the level of satisfaction is related to
or affected by gender, what is the appropriate table of conditional
probabili- ties ANS Satisfied Somewhat
Satisfied Not
Satisfied Total
Male 35.3% 35.3% 29.4% 100%
Female 25.0% 11.1% 63.9% 100%