Question

Yugendran's progress report card shows his marks as follows. Draw a pie chart exhibiting his marks in various subjects.

Subject	Tamil	English	Mathematics	Science	Social Science
Marks	72	60	84	70	74

Answer 1

Hint: In a pie chart, we represent the share of various quantities from a whole in terms of their percentage which means per hundred.
The respective quantities can be converted to percentage using the following method.
Let two quantities be a and b, then their respective percentage is:
$\dfrac{a}{{a + b}} \times 100$ or
$\dfrac{b}{{a + b}} \times 100$

Complete step-by-step answer:
We draw pie charts in a circular manner representing different categories in percentage with different colours.
First we can convert various quantities in terms of percentage:
Sum of all the quantities:
72 + 60 + 84 + 70 + 74 = 360
Percentage of respective quantity can be given by dividing it by the sum of all quantities and multiplying with 100.

Subject	Tamil	English	Mathematics	Science	Social Science
Marks	72	60	84	70	74
Percentage calculation	$\dfrac{{72}}{{360}} \times 100 = 20$	$ \dfrac{{60}}{{360}} \times 100 = 16.66 \\ \approx 17 \\ $	$ \dfrac{{84}}{{360}} \times 100 = 23.33 \\ \approx 23 \\ $	$ \dfrac{{70}}{{360}} \times 100 = 19.44 \\ \approx 19 \\ $	$ \dfrac{{74}}{{360}} \times 100 = 20.55 \\ \approx 21 \\ $
Percentage	20 %	17 %	23 %	19 %	21 %

Plotting this information on a pie chart:

This is the required pie chart of the given data.
It is important to mention which colours represent which quantity.

Note: $' \approx '$ is used for approximation and is pronounced as approximately equal to. When the term is more than 0.50 then it is rounded off to larger value and when smaller, it is rounded off to the smaller value.
e.g. 16.66 is approximately equal to 17 and not 16 because 0.66 > 0.50 whereas
19.44 is approximately equal to 19 and not 20 because 0.44 < 0.50