Study Materials

NCERT Solutions for Class 9th Mathematics

 

Page 4 of 4

Chapter 14. Statistics

Exercise 14.4

 

 

 

Important-Questions

 

Q1.  Find the value of x if median of Data is 49.

        32, 42, 45, x, x + 2, 53, 54, 56

Q2.  Find the mode of the following data:
        5, 7, 6, 5, 9, 8, 6, 7, 11, 10, 5, 7, 6, 8, 6, 9, 10.

Q3.  If the arithmetic mean of 25, 30, 32, x, 43 is 34, then find the value of x.

Q4. The points scored by a basket-ball team in a series of matches are as follows:
       17, 2, 7, 27, 25, 5, 14, 18 , 10, 24, 10, 8, 7, 10
        Find mean, median and mode for the data.

Q5. Find  the Mode of following data;

2, 3, 4, 5, 0, 1, 3, 3, 4, 3 

Q6. The followings data are written in ascending orders. If the median of data is 14.5then find the value of x.

      11, 12, 13, 7x, 7x + 1, 16, 16, 18, 20

Q7.  Find the median of 34, 32, x, x-1, 19, 15, 11 where x is the mean of data
10, 20, 30, 40, 50.

Q8.  If the mean of 10, 12, 18, 11, p and 19 is 15 then find the value of p and
also find the median.

        

      

Q10. What is the range for the given data 
         31, 32.5, 20.3, 27.9, 28, 19.7, 31.7.

Q11. Find the mode for the data given below 
         14, 25, 14, 28, 18, 17, 14, 23, 22, 14, 18.

Q12. If the mean of 6, 8, 5, 7, x and 4 is 7 then find the value of x.

Q13.  Find the mean for 
          4, 3, 7, 0, 0, 6, 8.

Q14.  Find the mode for the following :-
          7, 9, 12, 13, 7, 12, 15, 7, 12, 7, 25, 18, 7.

Q15.  If means of 1 x , 2 x is 6 and mean of 1 x , 2 x and 3 x is 7 then find 3 x .

Q16.  If 3 is the mean for x, 3, 4, 5 then find the value of x.

Q17.  What is the range of 40, 42, 80, 69, 56, 47?

Q18.  The class marks are given below 
          47, 52, 57, 62, 67, 72, 77, 82
          What is the class size?

Q19.  Find the median :-
          36, 39, 42, 48, 52, 68, 69, 71, 72, 78.

Q20.  One student has scored the marks in five subject as below
          70, 64, 56, 54, 51.
          find the mean.

 

 

 

 

Page 4 of 4

 

Chapter Contents: