Study Materials

# NCERT Solutions for Class 9th Mathematics

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## Chapter 14. Statistics

### 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.

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