Introduction to Statistics Quiz - CBSE Class 9 Mathematics

Free practice quiz: Introduction to Statistics (CBSE Class 9 Mathematics). 20 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

Sample questions

1. Which of the following is a measure of central tendency?

   1. Mean
   2. Range
   3. Variance
   4. Skewness
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   Answer: A. Mean

   The mean is a measure of central tendency that represents an average value of a set of numbers.

2. What is the range of the following data set: 3, 7, 9, 15?

   1. 12
   2. 6
   3. 15
   4. 3
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   Answer: A. 12

   The range is the difference between the highest and lowest values. In this case, 15 - 3 = 12.

3. Which is not a measure of spread in statistics?

   1. Mean
   2. Range
   3. Variance
   4. Standard deviation
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   Answer: A. Mean

   Mean is a measure of central tendency, not a measure of spread. Range, variance, and standard deviation are measures of spread.

4. Which of the following is a type of categorical data?

   1. Age
   2. Income
   3. Color
   4. Height
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   Answer: C. Color

   Categorical data represents characteristics and can be divided into groups (e.g., colors).

5. What is a common graphical method to identify outliers in data?

   1. Histogram
   2. Box plot
   3. Line graph
   4. Scatter plot
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   Answer: B. Box plot

   Box plots visually depict data distribution and highlight outliers, which are data points that fall outside the 'whiskers' of the plot.

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