NCERT Mathematics Class 9 Exemplar Ch 14 Statistics and Probability Part 10 (For CBSE, ICSE, IAS, NET, NRA 2022)

Get unlimited access to the best preparation resource for CBSE/Class-9 Science: fully solved questions with step-by-step explanation- practice your way to success.

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

The Mean of the Following Distribution
FrequencyVariable
44
86
148
1110
312

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

Answer:

Construct the Frequency Distribution Table
Class intervalsFrequency
Total