1|Page
ELEMENTARY STATISTICS 14TH EDITION TRIOLA
(2026) | COMPLETE TEST BANK | NGN-STYLE
QUESTIONS
Provide an appropriate response.
Grade points are assigned as follows: A = 4, B = 3, C = 2, D = 1, and F = O. Grades are
weighted according to credit hours. If a student receives an A in a four-unit class, a D in a
two-unit class, a B in a three-unit class and a C in a three-unit class, what is the student's
grade point average?
2.75
Provide an appropriate response.
The lengths of phone calls from one household (in minutes) were 2, 4, 6, 7, and 8 minutes.
Find the midrange for this data.
2 minutes
5 minutes
6 minutes
10 minutes
5 min
Provide an appropriate response.
Find the range of the data set represented by the graph.
6
20
5
17
6
Provide an appropriate response.
Find the sample standard deviation.
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2 6 15 9 11 22 1 4 8 19
7.1
Provide an appropriate response.
The mean score of a placement exam for entrance into a math class is 80, with a standard
deviation of 10. Use the Empirical Rule to find the percentage of scores that lie between 60
and 80. (Assume the data set has a bell-shaped distribution.)
95%
34%
47.5%
68%
47.5%
Provide an appropriate response.
The mean score of a competency test is 77, with a standard deviation of 4. Use the
Empirical Rule to find the percentage of scores between 69 and 85. (Assume the data set
has a bell-shaped distribution.)
95%
68%
50%
99.7%
95%
Provide an appropriate response.
The mean SAT verbal score is 478, with a standard deviation of 98. Use the Empirical Rule
to determine what percent of the scores lie between 380 and 478. (Assume the data set has a
bell-shaped distribution.)
34%
47.5%
68%
49.9%
34%
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Use the grouped data formulas to find the indicated mean or standard deviation.
The manager of a bank recorded the amount of time a random sample of customers spent
waiting in line during peak business hours one Monday. The frequency distribution below
summarizes the results. Approximate the sample mean. Round your answer to one decimal
place.
9.0
13.5
9.2
7.7
9.2
Use the grouped data formulas to find the indicated mean or standard deviation.
A random sample of 30 high school students is selected. Each student is asked how many
hours he or she spent on the Internet during the previous week. The results are shown in
the histogram. Estimate the sample mean.
8.1
8.3
7.9
7.7
7.9
Provide an appropriate response.
In a random sample, 10 students were asked to compute the distance they travel one way to
school to the nearest tenth of a mile. The data is listed below.
a) If a constant value k is added to each value, how will the standard deviation be affected?
b) If each value is multiplied by a constant k, how will the standard deviation be affected?
1.1 5.2 3.6 5.0 4.8 1.8 2.2 5.2 1.5 0.8
The standard deviation will not be affected.
The cholesterol levels (in milligrams per deciliter) of 30 adults are listed below. Find Q1.
154 156 165 165 170 171 172 180 184 185
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189 189 190 192 195 198 198 200 200 200
205 205 211 215 220 220 225 238 255 265
180
Provide an appropriate response.
Find the z-score for the value 55, when the mean is 58 and the standard deviation is 3.
z = 0.90
z = -0.90
z = -1.00
z = -1.33
z= -1.00
Provide an appropriate response.
The test scores of 30 students are listed below. Find P30.
31 41 45 48 52 55 56 63 65 67 67 69 70 70 74 75 78 79 79 80 81 83 85 85 87 90 92 95 99
67
56
90
63
63
Provide an appropriate response.
A teacher gives a 20-point quiz to 10 students. The scores are listed below. What percentile
corresponds to the score of 12?
80 8 10 7 15 16 12 19 14 9
13
12
25
40
40
ELEMENTARY STATISTICS 14TH EDITION TRIOLA
(2026) | COMPLETE TEST BANK | NGN-STYLE
QUESTIONS
Provide an appropriate response.
Grade points are assigned as follows: A = 4, B = 3, C = 2, D = 1, and F = O. Grades are
weighted according to credit hours. If a student receives an A in a four-unit class, a D in a
two-unit class, a B in a three-unit class and a C in a three-unit class, what is the student's
grade point average?
2.75
Provide an appropriate response.
The lengths of phone calls from one household (in minutes) were 2, 4, 6, 7, and 8 minutes.
Find the midrange for this data.
2 minutes
5 minutes
6 minutes
10 minutes
5 min
Provide an appropriate response.
Find the range of the data set represented by the graph.
6
20
5
17
6
Provide an appropriate response.
Find the sample standard deviation.
,2|Page
2 6 15 9 11 22 1 4 8 19
7.1
Provide an appropriate response.
The mean score of a placement exam for entrance into a math class is 80, with a standard
deviation of 10. Use the Empirical Rule to find the percentage of scores that lie between 60
and 80. (Assume the data set has a bell-shaped distribution.)
95%
34%
47.5%
68%
47.5%
Provide an appropriate response.
The mean score of a competency test is 77, with a standard deviation of 4. Use the
Empirical Rule to find the percentage of scores between 69 and 85. (Assume the data set
has a bell-shaped distribution.)
95%
68%
50%
99.7%
95%
Provide an appropriate response.
The mean SAT verbal score is 478, with a standard deviation of 98. Use the Empirical Rule
to determine what percent of the scores lie between 380 and 478. (Assume the data set has a
bell-shaped distribution.)
34%
47.5%
68%
49.9%
34%
,3|Page
Use the grouped data formulas to find the indicated mean or standard deviation.
The manager of a bank recorded the amount of time a random sample of customers spent
waiting in line during peak business hours one Monday. The frequency distribution below
summarizes the results. Approximate the sample mean. Round your answer to one decimal
place.
9.0
13.5
9.2
7.7
9.2
Use the grouped data formulas to find the indicated mean or standard deviation.
A random sample of 30 high school students is selected. Each student is asked how many
hours he or she spent on the Internet during the previous week. The results are shown in
the histogram. Estimate the sample mean.
8.1
8.3
7.9
7.7
7.9
Provide an appropriate response.
In a random sample, 10 students were asked to compute the distance they travel one way to
school to the nearest tenth of a mile. The data is listed below.
a) If a constant value k is added to each value, how will the standard deviation be affected?
b) If each value is multiplied by a constant k, how will the standard deviation be affected?
1.1 5.2 3.6 5.0 4.8 1.8 2.2 5.2 1.5 0.8
The standard deviation will not be affected.
The cholesterol levels (in milligrams per deciliter) of 30 adults are listed below. Find Q1.
154 156 165 165 170 171 172 180 184 185
, 4|Page
189 189 190 192 195 198 198 200 200 200
205 205 211 215 220 220 225 238 255 265
180
Provide an appropriate response.
Find the z-score for the value 55, when the mean is 58 and the standard deviation is 3.
z = 0.90
z = -0.90
z = -1.00
z = -1.33
z= -1.00
Provide an appropriate response.
The test scores of 30 students are listed below. Find P30.
31 41 45 48 52 55 56 63 65 67 67 69 70 70 74 75 78 79 79 80 81 83 85 85 87 90 92 95 99
67
56
90
63
63
Provide an appropriate response.
A teacher gives a 20-point quiz to 10 students. The scores are listed below. What percentile
corresponds to the score of 12?
80 8 10 7 15 16 12 19 14 9
13
12
25
40
40
