Class 10 Maths — Chapter 13: STATISTICS

What you'll learn

• ▸Mean of Grouped Data by Direct Method
• ▸Mean of Grouped Data by Assumed Mean Method
• ▸Mean of Grouped Data by Step-Deviation Method
• ▸Concept of Class Mark
• ▸Mean of Ungrouped Frequency Distribution
• ▸Comparison of Mean from Ungrouped vs Grouped Data

Chapter Summary

--- PAGE 1 --- 1062CH14 STATISTICS 13 13.1 Introduction In Class IX, you have studied the classification of given data into ungrouped as well as grouped frequency distributions. You have also learnt to represent the data pictorially in the form of various graphs such as bar graphs, histograms (including those of varying widths) and frequency polygons. In fact, you went a step further by studying certain numerical representatives of the ungrouped data, also called measures of central tendency, namely, mean, median and mode. In this chapter, we shall extend the study of these three measures, i.e., mean, median and mode from ungrouped data to that of grouped data. We shall also discuss the concept of cumulative frequency, the cumulative frequency distribution and how to draw cumulative frequency curves, called ogives. 13.2 Mean of Grouped Data The mean (or average) of observations, as we know, is the sum of the values of all the observations divided by the total number of observations.…

Practice Questions from this Chapter

Tap "Get Solution" on any question to ask our AI tutor.

1. Explain mean, median, mode simply. Get Solution →
2. Give real-world examples of data. Get Solution →
3. Visualize data with a graph. Get Solution →
4. What are mean, median, and mode collectively known as? Get Solution →
5. In statistics, what does the Greek letter Σ (capital sigma) signify? Get Solution →
6. How is the 'class mark' for a class interval determined? Get Solution →
7. What is the name of the first method discussed for finding the mean of grouped data, which involves calculating Σfᵢxᵢ? Get Solution →
8. In the Assumed Mean method formula dᵢ = xᵢ - a, what does 'a' represent? Get Solution →

Did you know?

• 💡 The total amount of data in the world is too vast for any single person to ever see.
• 💡 Ancient Egyptians used statistics to predict the flooding of the Nile River for farming.
• 💡 The average person spends about six months of their life waiting for red traffic lights.
• 💡 Your phone uses statistics to predict the next word you will type.
• 💡 If you gather 23 random people, there's a 50% chance two share a birthday.

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