Using tally marks, represent the numbers as symbol, 20, 19, 22, 21.

2

(a)

How many values in bar graph is represented by each bar.

2

(a)

What is data?

2

(a)

What does represent in tally marks?

2

(a)

What are bar graphs?

2

(a)

What are pictographs?

2

(a)

What is the range of data?

2

(a)

Find the range of data 9, 7, 2, 6, 1, 3, 4, 12.

2

(a)

What kind of data is collected directly from a source?

2

(a)

In a pictograph, a symbol represents 5 persons, then how many symbols represent 20 persons.

2

(a)

Observe the following table and answer the related questions.

Blood group	Number of students
A	10
B	8
O	12
AB	15

(a) Which blood group is the most common?
(b) Which blood group is the rarest?
(c) What is the total number of students?

2

(a)

Complete the following table

2

(a)

Which method is the best? Why?

2

(a)

Which method is more useful when information from a much larger data is required?

2

(a)

       
In the above example, the number of people who like red colour was taken as 50 + 5. If your friend wishes to take it as 50 + 8, is it acceptable?

2

(a)