Mathematics for IGCSE & O level - Statistical Diagrams (Section 2)
1
Based on the key points regarding cumulative frequency diagrams, what is true?
Răspuns
A
B
D
2
What type of data is suitable for displaying on a histogram?
Răspuns
(C)
Continuous data
3
What does the area under each bar in a histogram represent?
Răspuns
(B)
Frequency
4
In a cumulative frequency diagram, the value on the x-axis that corresponds to 50% on the y-axis is:
Răspuns
(B)
The median
5
How is the median value of data found from a cumulative frequency diagram?
Răspuns
(B)
Look up the value at 50% cumulative frequency.
6
What are the benefits of using cumulative frequency diagrams?
Răspuns
A
B
D
7
The pictogram below depicts the number of books borrowed, how many books were borrowed on Wednesday?
Răspuns
(B)
25
8
If a cumulative frequency graph is flat, what does this indicate?
Răspuns
(B)
A zero frequency.
9
How does the frequency density relate to the class width and frequency in a histogram?
Răspuns
(A)
Frequency Density = Frequency / Class Width
10
What is the most common eye color based on the bar chart?
Răspuns
(B)
Blue
11
What is the purpose of the horizontal axis on a histogram?
Răspuns
(A)
To display the class intervals
12
In the context of the histogram, what does the area of each bar represent?
Răspuns
(A)
Frequency
13
What does a negatively skewed histogram look like?
Răspuns
(A)
The tail is on the left side.
14
In a histogram, which axis is used to plot the frequency density?
Răspuns
(B)
Vertical axis
15
How is the lower quartile estimated using a cumulative frequency diagram?
Răspuns
(A)
The value on the x-axis corresponding to the 25th percentile.
16
How do you calculate the frequency density of a particular class interval?
Răspuns
(B)
Frequency / Class Width
17
What is the advantage of using a pictogram over a bar chart?
Răspuns
(C)
Pictograms are easier to understand for people.
18
In the context of a cumulative frequency graph, what does a steep slope indicate?
Răspuns
(B)
High frequencies
19
What does a symmetrical histogram suggest?
Răspuns
(C)
A normal distribution
20
Which of the following is a characteristic of a cumulative frequency diagram?
Răspuns
(A)
The y-axis always starts at zero.
21
What is the formula for calculating frequency density?
Răspuns
(A)
Frequency Density = Frequency / Class Width
22
What does a histogram represent?
Răspuns
(D)
The distribution of continuous data
23
What is the total number of computers and printers sold in Week 3?
Răspuns
(B)
25
24
What is the primary difference between a bar chart and a histogram?
Răspuns
(A)
Histograms display continuous data, while bar charts show categorical data.
25
Based on the bar chart, which eye color has the second most students?
Răspuns
(C)
Grey
26
If the frequency is 14 and the class width is 10, what is the frequency density?
Răspuns
(B)
1.4
27
What can be found from a cumulative frequency diagram?
Răspuns
A
C
D
28
When is it particularly important to use frequency density rather than simply frequency in a histogram?
Răspuns
(C)
When the class intervals have unequal widths.
29
If the class widths in a histogram are unequal, what must be considered when interpreting the diagram?
Răspuns
(B)
The frequency density of each class
30
How can you find the number of data points within a specific range using a cumulative frequency diagram?
Răspuns
(A)
Subtract the cumulative frequencies at the start and end of the range.
31
Based on the key points, which of the following statements are true regarding a line of best fit?
Răspuns
A
B
C
32
What is the significance of the area of each bar in a histogram?
Răspuns
(A)
It represents the frequency of that class.
33
Which of the following statements is accurate regarding correlation?
Răspuns
(D)
A scatter diagram can be used to identify a relationship (correlation) between two sets of data.
34
In a positively skewed distribution, what is the general position of the mode relative to the median?
Răspuns
(B)
The mode is less than the median.
35
Which of the following diagrams is most suitable for displaying continuous data?
Răspuns
(C)
Histogram
36
In the context of cumulative frequency diagrams, what does the 75th percentile represent?
Răspuns
(C)
The upper quartile
37
What must be calculated first to draw a histogram?
Răspuns
(C)
Frequency density
38
Based on the bar chart, in which week was the difference between computer and printer sales the greatest?
Răspuns
(B)
Week 2
39
How can the median be found using the cumulative frequency diagram?
Răspuns
(C)
By finding the x-axis value corresponding to the 50th percentile.
40
What is calculated as 'frequency / class width'?
Răspuns
(B)
Frequency density
41
In which week were the most printers sold?
Răspuns
(B)
Week 2
42
What should be plotted on the y-axis in a histogram?
Răspuns
(B)
Frequency Density
43
What kind of correlation is present when the data points on a scatter diagram are scattered and do not show a clear trend?
Răspuns
(C)
No Correlation
44
Which of the following statements accurately describes a positively skewed distribution?
Răspuns
(D)
The mean is greater than the median.
45
What does the shape of a cumulative frequency graph indicate?
Răspuns
(A)
The distribution of data
46
What type of graph is the best suited for showing the distribution of data?
Răspuns
(C)
Histogram
47
What information can be gained from a histogram?
Răspuns
A
B
D
48
What type of data is typically represented using a cumulative frequency diagram?
Răspuns
(C)
Continuous data
49
Which type of correlation is shown in the scatter diagram where the points are closely clustered in a line, as one quantity increases, so does the other?
Răspuns
(A)
Strong positive correlation
50
How many books do the symbol in the pictogram represent?
