# NCERT Mathematics Class 9 Exemplar Ch 14 Statistics and Probability Part 10

Q.10. Obtain the mean of the following distribution:

 Frequency Variable 4 4 8 6 14 8 11 10 3 12

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.

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.

Q.13. Ten observations are written in an ascending order. The median of the data is 24. Find the value of x.

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