Statistics-Sample Questions

1.   If the mean of the following data is 18.75, then find teh value of p.

        

2.   Following data gives the marks (out of 50), obtained by 30 students of a class in a test:

             

3.   If the marks of 41 students of a class are given in the following table, then find the median of marks obtained.

4.   Following table gives the distribution of two sections of a class according to the marks obtained by them:

5.   Five people were asked about the time in a week they spend in doing social work in their community. They said 10, 7, 13, 20, and 15 hours, respectively. Find the mean (or average) time in a week devoted by then for social work.

6.   Find the mean of the marks obtained by 30 students of class IX of a school. The marks are:

             

7.   Find the mean of the following data.

             

8.   Find the value of p when the mean of the following data is 21.6.

             

9.   The heights (in cm) of 9 students of a class are as follows:

             155,      160,      145,      149,      150,      147,      152,      144,      148

        Find the median of this data.

10.   The points scored by the team of kabaddi in a series of matches are as follows:

             17,      2,      7,      27,      15,      5,      14,      8,      10,      24,      48,      10,      8,      7,      18,      28.

        Find the median of the points scored by the team.

11.   Find the mode of the following marks (out of 10) obtained by 20 students:

             

12.   In a small unit of a factory 5 employees (a supervisor and four labourers) are working. The laboures draw a salary of Rs. 5000 per month each while the supervisor gets Rs. 15,000 per month. Calculate the mean, median and mode of the salaries of the unit of the factory.