The following frequency histogram represents the IQ scores of a random sample of seventh-grade students. IQs are measured to the nearest whole number. The frequency of each class is labeled above each rectangle. Use the histogram to answers parts (a) through (g). (a) How many students were sampled? students (b) Determine the class width. The class width is Frequency 80+ 60- 40- 20- A. 105 B. 100-109 C. 100-110 D. 90-99 IQs of 7th Grade Students 14 50 44 41 33 8 1 3 42 60 70 80 90 100 110 120 130 140 150 160 IQ scores (c) Identify the classes and their frequencies. Choose the correct answer below. O A. 60-70, 1; 70-80, 3; 80-90, 14; 90-100, 44; 100-110, 50; 110-120, 41; 120-130, 33; 130-140, 8; 140-150, 4; 150-160, 2 B. 65, 1; 75, 3; 85, 14; 95, 44; 105, 50; 115, 41; 125, 33; 135, 8; 145, 4; 155, 2 C. 60-69, 1; 70-79, 3; 80-89, 14; 90-99, 44; 100-109, 50; 110-119, 41; 120-129, 33; 130-139, 8; 140-149, 4; 150-159, 2 (d) Which class has the highest frequency?
The following frequency histogram represents the IQ scores of a random sample of seventh-grade students. IQs are measured to the nearest whole number. The frequency of each class is labeled above each rectangle. Use the histogram to answers parts (a) through (g). (a) How many students were sampled? students (b) Determine the class width. The class width is Frequency 80+ 60- 40- 20- A. 105 B. 100-109 C. 100-110 D. 90-99 IQs of 7th Grade Students 14 50 44 41 33 8 1 3 42 60 70 80 90 100 110 120 130 140 150 160 IQ scores (c) Identify the classes and their frequencies. Choose the correct answer below. O A. 60-70, 1; 70-80, 3; 80-90, 14; 90-100, 44; 100-110, 50; 110-120, 41; 120-130, 33; 130-140, 8; 140-150, 4; 150-160, 2 B. 65, 1; 75, 3; 85, 14; 95, 44; 105, 50; 115, 41; 125, 33; 135, 8; 145, 4; 155, 2 C. 60-69, 1; 70-79, 3; 80-89, 14; 90-99, 44; 100-109, 50; 110-119, 41; 120-129, 33; 130-139, 8; 140-149, 4; 150-159, 2 (d) Which class has the highest frequency?
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:The following frequency histogram represents the IQ
scores of a random sample of seventh-grade
students. IQs are measured to the nearest whole
number. The frequency of each class is labeled
above each rectangle. Use the histogram to answers
parts (a) through (g).
(a) How many students were sampled?
students
(b) Determine the class width.
The class width is
Frequency
A. 105
B. 100-109
C. 100-110
D. 90-99
80+
60-
40-
20-
IQs of 7th Grade Students
14
50
44 41
33
8
1 3
42
60 70 80 90 100 110 120 130 140 150 160
IQ scores
(c) Identify the classes and their frequencies. Choose the correct answer below.
O A. 60-70, 1; 70-80, 3; 80-90, 14; 90-100, 44; 100-110, 50; 110-120, 41; 120-130, 33; 130-140, 8; 140-150, 4;
150-160, 2
B.
65, 1; 75, 3; 85, 14; 95, 44; 105, 50; 115, 41; 125, 33; 135, 8; 145, 4; 155, 2
C. 60-69, 1; 70-79, 3; 80-89, 14; 90-99, 44; 100-109, 50; 110-119, 41; 120-129, 33; 130-139, 8; 140-149, 4;
150-159, 2
(d) Which class has the highest frequency?
Transcribed Image Text:(d) Which class has the highest frequency?
A. 105
B. 100-109
C. 100-110
D. 90-99
(e) Which class has the lowest frequency?
OA. 65
OB. 150-159
C. 60-70
D. 60-69
(f) What percent of students had an IQ of at least 130?
% (Type an integer or a decimal. Do not round.)
(g) Did any students have an IQ of 166?
O A. No, because there is a bar in the 150-159 class.
0 0 0 O
B. No, because there are no bars, or frequencies, greater than an IQ of 160.
C. Yes, because there is a bar in the 150-159 class.
D. Yes, because there is a frequency of a score of 165.
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