NCERT Mathematics Class 9 Exemplar Ch 14 Statistics and Probability Part 10
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Q.10. Obtain the mean of the following distribution:
| Frequency | Variable |
| 4 | 4 |
| 8 | 6 |
| 14 | 8 |
| 11 | 10 |
| 3 | 12 |
Answer:
Q.11. A class consists of 50 students out of which 30 are girls. The mean of marks scored by girls in a test is 73 (out of 100) and that of boys is 71. Determine the mean score of the whole class.
Answer:
Q.12. Mean of 50 observations was found to be 80.4. But later on, it was discovered that 96 was misread as 69 at one place. Find the correct mean.
Answer:
Q.13. Ten observations are written in an ascending order. The median of the data is 24. Find the value of x.
Answer:
Q.14. The points scored by a basketball team in a series of matches are as follows: Find the median and mode for the data.
Answer: Median = , mode =
Q.15. In Fig. 14.2, there is a histogram depicting daily wages of workers in a factory. Construct the frequency distribution table.
Depicting Daily Wages of Workers in a Factory
Depicting daily wages of workers in a factory
Answer:
| Class intervals | Frequency |
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