Statistics
ICSE · Class 9 · Mathematics
Practice quiz for Statistics — ICSE Class 9 Mathematics. MCQs and questions with answers to test your preparation.
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A class of 20 students scored the following marks out of 10: 7, 8, 6, 9, 7, 8, 5, 6, 7, 8, 9, 6, 7, 8, 5, 6, 7, 8, 9, 6. What is the frequency of the score 7?
In a frequency distribution table with class intervals 10-20, 20-30, 30-40, the frequencies are 5, 8, and 3 respectively. What is the cumulative frequency of the class 30-40?
What is the class mark of the class interval 25-35?
In the data set: 12, 15, 18, 12, 20, 15, 12, what is the range?
Sample Questions
Which of the following represent discrete variables?
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Number of students in a class, Number of books in a library, Number of cars in a parking lot
Discrete variables can only take specific whole number values and cannot be subdivided. Number of students, books, and cars are countable items. Height and weight are continuous variables as they can take any value within a range.
A frequency distribution has class intervals: 0-10, 10-20, 20-30, 30-40 with frequencies 3, 7, 5, 2 respectively. How many observations are there in total?
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17
Total observations = Sum of all frequencies = 3 + 7 + 5 + 2 = 17. Each frequency represents the count of observations in that particular class interval.
What is the class size for the class interval 45-55?
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10
Class size = Upper limit - Lower limit = 55 - 45 = 10. Class size represents the width or span of the class interval.
Which of the following are characteristics of a histogram?
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Rectangles touch each other, Used for continuous data, Height represents frequency
In a histogram, rectangles touch each other (no gaps) because it represents continuous data. The height of each rectangle represents the frequency of that class interval. Bar charts have gaps, not histograms.
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