Class 7, Maths, Chapter 3, Exercise 3.2 Solutions
Q.1. The scores in mathematics test (out of 25) of 15 students is as follows: 19, 25, 23, 20, 9, 20, 15, 10, 5, 16, 25, 20, 24, 12, 20
Find the mode and median of this data. Are they same?
Q.2. The runs scored in a cricket match by 11 players is as follows: 6, 15, 120, 50, 100, 80, 10, 15, 8, 10, 15
Find the mean, mode and median of this data. Are the three same?
Q.3. The weights (in kg.) of 15 students of a class are: 38, 42, 35, 37, 45, 50, 32, 43, 43, 40, 36, 38, 43, 38, 47
(i) Find the mode and median of this data.
(ii) Is there more than one mode?
Q.4. Find the mode and median of the data: 13, 16, 12, 14, 19, 12, 14, 13, 14
Q.5. Tell whether the statement is true or false:
(i) The mode is always one of the numbers in a data.
(ii) The mean is one of the numbers in a data.
(iii) The median is always one of the numbers in a data.
(iv) The data 6, 4, 3, 8, 9, 12, 13, 9 has mean 9.
Ans:
(i) True
(ii) False
(iii) True
(iv) False
Explanation of (iv):
Mean $=\frac{Sum\,\,of\,\,observations}{No.\,\,of\,observations\,\,}$
$=\frac{6+4+3+8+9+12+13+9}{8}=\frac{64}{8}=8\ne 9$