Statistics — Important Questions
ICSE · Class 9 · Mathematics
41 important questions from Statistics for ICSE Class 9 Mathematics, with answers. Includes multiple choice and multiple correct questions.
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Important Questions from Statistics
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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