Class 9 • Maths • Chapter 12
STATISTICS
True & False Quiz
Data. Frequency. Mean.
✓True
✗False
25
Questions
|
Ch.12
Chapter
|
IX
Class
Why True & False for STATISTICS?
How this format sharpens your conceptual clarity
🔵 Statistics introduces the tools for organising and summarising data — the foundation for Class X grouped data statistics and real-world data analysis.
✅ T/F questions test mean calculation for ungrouped and grouped data (direct method), range, class mark, and frequency.
🎯 Class mark = (lower limit + upper limit) / 2 — it is the midpoint of the class interval, NOT the frequency.
📋
Read each statement carefully. Click True or False — instant feedback with explanation appears. Submit anytime; unattempted questions are marked Skipped.
Q 1
Statistics deals with collection, presentation, and interpretation of data.
Q 2
Ungrouped data is also called raw data.
Q 3
Grouped data is divided into class intervals.
Q 4
The range of a dataset is calculated as highest value minus lowest value.
Q 5
Frequency is the number of times a particular value appears in the dataset.
Q 6
The sum of frequencies in a frequency distribution is equal to the total number of observations.
Q 7
Class intervals in a frequency distribution can be unequal.
Q 8
A frequency table arranges collected data into classes and their frequencies.
Q 9
There can be gaps between the bars in a histogram.
Q 10
Histograms are always drawn for continuous data.
Q 11
A bar graph is suitable for representing discrete or categorical data.
Q 12
Frequency polygons are constructed by joining midpoints of histogram tops.
Q 13
In a frequency polygon, the points are joined by straight lines.
Q 14
Continuous data must be organized into continuous class intervals before drawing a histogram.
Q 15
Cumulative frequency helps determine the number of observations below a certain class boundary.
Q 16
The range can be zero if all observations are the same.
Q 17
In statistics, data may be collected from primary or secondary sources.
Q 18
Tally marks are used for counting frequencies in ungrouped data.
Q 19
Lower and upper class limits define boundaries of a class interval.
Q 20
Pie charts are used for comparing parts of a whole in percentage terms.
Q 21
In histogram, the area of rectangle is proportional to the corresponding frequency.
Q 22
A frequency table can have decimal values as frequencies.
Q 23
Cumulative frequency increases or remains the same with each successive class.
Q 24
Class boundary is found by averaging the upper limit of one class and the lower limit of next class.
Q 25
Statistical data can only be represented as tables, not as diagrams or graphs.
Key Takeaways — STATISTICS
Core facts for CBSE Boards & exams
1
Range = Maximum value − Minimum value.
2
Class mark = (Lower class limit + Upper class limit) / 2.
3
Mean (ungrouped) = Σxᵢ / n (sum of all observations ÷ total count).
4
Mean (grouped, direct) = Σfᵢxᵢ / Σfᵢ, where xᵢ = class mark.
5
Frequency: number of times a value or class appears in the data.
6
Class width (class size) = Upper class limit − Lower class limit.