Question 1

How is the frequency 7 represented using standard tally marks?

Accepted Answer

Tally marks are written in groups of 5, where 4 vertical lines are crossed diagonally by the 5th line. So, 7 is represented as a group of 5 plus 2 vertical lines (卌 ||).

Question 2

In the class interval 20 – 30, what is the upper class limit?

Accepted Answer

In any class interval 'a – b', 'a' is called the lower class limit and 'b' is called the upper class limit. Thus, for 20 – 30, the upper class limit is 30.

Question 3

What is the class width (or class size) of the interval 40 – 55?

Accepted Answer

Class size = Upper Limit – Lower Limit = 55 – 40 = 15.

Question 4

What is the total sum of all central angles in a pie chart?

Accepted Answer

A pie chart represents data in a circle, and the total angle at the centre of a circle is 360°.

Question 5

If an item constitutes 25% of the total dataset, what will be the central angle of its sector in a pie chart?

Accepted Answer

Central Angle = (Percentage / 100) × 360° = (25 / 100) × 360° = 90°.

Data Handling