SChand Composite Mathematics Class 7 Chapter 15 Data Handling Exercise 15B

 Exercise 15 B 

Question 1

The median of a set of numbers is the middle number when all the numbers are arranged in order of size, i.e., in descending or ascending order.

Find the median of the following. 

(1) 2,3,5,7,9 = 5

(2) 4,8,12,16,20,24, 28,32 

=16,20

median $=\frac{16+20}{2}=\frac{36}{2}=18$

(3) $60,33,63,61,44,48,51$ 

Sol: $33,44,48,51,60,61,63$

(4) $13,22,25,8,11,19,17,31,16,10$

Sol: $8,10,11,13,16,17,19,22,25,31$

median $=\frac{16+17}{2}=\frac{33}{2}=16.5$

Question 5

15 students secured the following marks in a test statistic . find the median marks 

35,2,13,17,20,30,19,29,11,10,29,23,18,25,17

Sol: Arrange in Ascending order. 

$10,11,13,17,17,18,19,20,23,25,28,29,29,30,35$

Question 6

The median of the number 85, 86,78,89 and 64 is 

Sol: $64,78,85,86,89$

Question 7

The marks scored by 10 students are 5,9,8,7,2,3,4,9, 6 and 8 . The median marks are '

Sol: $2,3,4,5,6,7,8,8,9,9$

Median $=\frac{6+7}{2}=\frac{13}{2}=6.5$

Question 8

If the median of 46, 64,88, 40 , x ,76,35,91,56,32 and 91 is 58 . find the value of x 

Sol: 32,35,40,46,56 , 64,7, 88, 91 ,91, 

x= 58 answer