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CBSE Class 9 Mathematics Statistics Worksheet
Solve the following questions based on the concepts of Statistics.
- The mean of 5 numbers is 20. If one number is excluded, the mean becomes 16. Find the excluded number.
- The median of the data 5,8,10,12,𝑥,14,16 is 11. Find the value of 𝑥x.
- The mean of 10 observations is 15. On rechecking, it was found that one observation, namely 25, was incorrectly copied as 52. Find the correct mean.
- The mean of 7 observations is 18. If one more observation is added, the new mean becomes 20. Find the added observation.
- The mean of 50 observations was found to be 35. Later, it was discovered that an observation 45 was misread as 54. Find the correct mean.
- The mean of 15 numbers is 45. If each number is multiplied by 4, find the new mean.
- If the mean of 4,8,10,12,18,𝑥 is 11, find the value of 𝑥x.
- The median of the data 4,6,8,10,12,𝑥is 9. Find the value of 𝑥x.
- The mean of 9 observations is 11.5. If one observation 13 is replaced by 8, find the new mean.
- The mean of the following frequency distribution is 45. Find the value of 𝑝p.
| Class Interval | Frequency |
| 10−20 | 6 |
| 20−30 | 𝑝 |
| 30−40 | 8 |
| 40−50 | 10 |
| 50−60 | 6 |
Answers:
- Excluded number = 24
- 𝑥=11
- Correct mean = 14.5
- Added observation = 344
- Correct mean = 34.1
- New mean = 180
- 𝑥=6
- 𝑥=10
- New mean = 11.33311.333
- 𝑝=6
| Related Worksheets | |
| CBSE Worksheet Chapter 1 Number System | CBSE Worksheet Chapter 2 Polynomials |
| CBSE Worksheet Chapter 6 Lines and Angles | CBSE Worksheet Chapter 12 Heron’s Formula |
Chapter 14 Statistics worksheet Mathematics CBSE Class 9
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