Page 207 - Maths Skills - 7

Data Handling 205

4. The value that occurs most frequently in a given Answer the following questions on the basis of the
data is called its: above data.
(i) mean (ii) mode 1. How many books were sold in 2012?
(iii) average (iv) median (i) 500 (ii) 700
5. Observations or numerical facts gathered (iii) 550 (iv) 600
initially are called: 2. In which year were about 250 books sold?
(i) grouped data (ii) raw data (i) 2011 (ii) 2009

(iii) frequency (iv) range
(iii) 2010 (iv) 2012
B. Fill in the Blanks 3. In which year were maximum books sold?
1. ________________ is the most frequently (i) 2009 (ii) 2008
occurring observation in a given data.
2. Arithmetic mean x = ________________ . (iii) 2012 (iv) 2010

3. Range = ______________ – ______________. 4. Can you explain how you would estimate the
4. A collection of ________________ information number of books sold in 2007.
of facts is called data. (i) 100 (ii) 600
(iii) 150 (iv) 0
C. Write ‘T’ for true and ‘F’ for false statements

1. A bar graph is the pictorial representation E. Assertion-Reason Based Questions
of data. Directions for Questions 1 to 3: In each of the
questions given below, there are two statements
2. Median in the most frequently occurring marked as Assertion (A) and Reason (R). Mark your
observation. answer as per the codes provided below:

3. Range is the difference between the highest (a) Both A and R are true and R is the correct
value and lowest value of observation. explanation of A.

4. A data arranged in groups is called raw data. (b) Both A and R are true but R is not the correct
explanation of A.
5. The mean of first ten natural numbers is 5.5.
(c) A is true but R is false.

D. Case Study Based Questions (d) A is false but R is true.
Read the bar graph which shows the number of books Q. 1. Assertion (A): The middle most observation of
sold by a book store during five consecutive years data is called the median.
and answer the following questions.
Reason (R): Median divides the data into two
equal parts.

700 Q. 2. Assertion (A): Mode of the data 0, 5, 6, 9, 1, 5,
7, 5, 11, 15, 5, 7 is 5

Books 500 Reason (R): Mode is the term that appears the
400
250 most.
200
100 Q. 3. Assertion (A): The mode is always one of the
0 numbers in data.
2008 2009 2010 2011 2012 Reason (R): Mode is always greater than mean
Years in a data.