Free Presentation of Data 03 Practice Test - 11th Grade - Commerce 

Question 1

For easy interpretation, a bar graph can be converted to a pie chart when:

A. absolute values are converted to percentages
B. percentages are converted to absolute values
C. Either A or B
D. Neither A nor B

SOLUTION

Solution : A

Although pie charts can be used for absolute values, inferences are easier when percentages are used.

Question 2

A group of school kids were asked for their favorite colors: 10 picked pink, 5 picked red, 11 pinked blue, 1 said white, 13 said purple, and 5 said green. How would you represent this data?

A. Bar Diagram
B. Histogram
C. Arithmetic line graph
D. Any of the above

SOLUTION

Solution : A

The given data is discrete as there is a clear separation between the colors. Hence, bar diagram can be used to represent this.

Question 3

In a histogram, two class intervals were 20-30 and 30-40 with corresponding heights 10 and 20 units. The class intervals were combined to form a single class interval 20-40. What is the height corresponding to this new class interval?

A. 10 units
B. 15 units
C. 20 units
D. 30 units

SOLUTION

Solution : B

In a histogram, the area of
rectangles corresponds to
the frequency of the classes. 
Before combining,
Frequency=10×10+10×20=300
The frequency after combining the classes
also will be the same. Suppose 'h' is the
height of the new class interval. Then,
Frequency=20×h=300h=30020=15

Question 4

Which of the following is(are) NOT true about tabular presentation?

A. Provides the quickest understanding of data when compared to textual/diagrammatic
B. A good table would have the essentials elements in it
C. The quickest way to present any type of data
D.  More than one type of information relation to the problem can be exhibited easily

SOLUTION

Solution : A and C

Options (a) and (c) are not true. Tabular presentations enable a quicker understanding of data when compared to textual but not diagrammatic. Also, for a huge amount of data it could be time-consuming and need not necessarily be the quickest way to present the data.

Question 5

Sum of the areas of all the rectangles of a histogram represents:

A. Sum of the frequencies of all the class intervals
B. Frequency of a class interval
C. Either A or B
D. Neither A nor B

SOLUTION

Solution : A

It represents the sum of frequencies of the given table.

Question 6

Cumulative frequency curve is also known as a(an) ___.

SOLUTION

Solution :

Cumulative frequency curve is also known as an ogive.

Question 7

An arithmetic line graph is also called as a ___ graph.

SOLUTION

Solution : An arithmetic line graph is called as a time-series graph as it is used to represent time-series data.

Question 8

___ is a curve which is plotted by joining the mid-points of all top edges of a histogram by freehand smoothed curves and not by straight lines.

SOLUTION

Solution : Frequency curve is plotted by joining the midpoints of the top edges of a histogram by smooth wavy lines and curves.

Question 9

Which of the following Frequency Distribution Graph(s) can be used to determine the value of Mode?

A. Histogram
B. Ogive
C. Frequency Polygon
D. Frequency Curve

SOLUTION

Solution : A

In a histogram, the area of rectangles represent the class frequency. Hence, mode can be determined graphically through histograms.

Question 10


Name the above shown curve.
 

A. More than ogive
B. Less than ogive
C. Either A or B
D. Neither A nor B

SOLUTION

Solution : A

In 'more than' ogives, we start with the lower limits of the classes & go on subtracting frequencies of each class. Here, more than cumulative frequencies of number of women is plotted against the lower limit of average monthly income.