Statistics — Class 9 Mathematics NCERT Solutions (Free)

Free step-by-step NCERT solutions for Class 9 Mathematics chapter "Statistics" — 7 important questions with detailed answers for CBSE board exam preparation.

TL;DR: Free step-by-step NCERT solutions for Class 9 Mathematics chapter "Statistics" — 7 important questions with detailed answers for CBSE board exam prepa…

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Key Questions Covered:

  1. Define mean, median, and mode for a set of data. For the data set {12, 15, 12…
  2. For the frequency distribution: Class 0-10 (frequency 5), 10-20 (frequency 8)…
  3. Construct a frequency distribution table and draw a bar graph for the followi…
  4. + 4 more questions in the full chapter

Solutions Summary:

Question Status
Define mean, median, and mode for a set of data. For the … ✓ Solved
For the frequency distribution: Class 0-10 (frequency 5),… ✓ Solved
Construct a frequency distribution table and draw a bar g… ✓ Solved

Showing 3 of 7 questions

Q1: Define mean, median, and mode for a set of data. For the data set {12, 15, 12, 18, 20, 12, 25}, find the mean, median, and mode.

Step 1: Definitions: Mean: The average of all values in the data set. Median: The middle value when data is arranged in order. Mode: The value that appears most frequently. Step 2: Given data set: {12, 15, 12, 18, 20, 12, 25} Number of values (n) = 7 Step 3: Calculate MEAN: Mean = (Sum of all valu...

Q2: For the frequency distribution: Class 0-10 (frequency 5), 10-20 (frequency 8), 20-30 (frequency 12), 30-40 (frequency 7), 40-50 (frequency 3). Find the mean of the grouped data.

Step 1: Create frequency distribution table: Class | Midpoint (x) | Frequency (f) | f×x 0-10 | 5 | 5 | 25 10-20 | 15 | 8 | 120 20-30 | 25 | 12 | 300 30-40 | 35 | 7 | 245 40-50 | 45 | 3 | 1...

Q3: Construct a frequency distribution table and draw a bar graph for the following data: Marks 40, 45, 50, 55, 60, 50, 45, 60, 65, 70, 60, 55, 50, 65, 70, 70. Use class intervals 40-50, 50-60, 60-70, 70-80.

Step 1: Raw data: 40, 45, 50, 55, 60, 50, 45, 60, 65, 70, 60, 55, 50, 65, 70, 70 (Total: 16 values) Step 2: Count frequencies for each class: Class 40-50: 40, 45, 45, 50, 50, 50 → Frequency = 6 Class 50-60: 55, 55, 60, 60, 60 → Frequency = 5 Class 60-70: 65, 65, 70, 70, 70 → Frequency = 5 Class 70-...

Showing 3 of 7 questions. Visit the full page for complete solutions.