Question

A survey was made to find the type of music that a certain group of young people liked in a city. Adjoining pie chart shows the findings of this survey.
From this pie chart answer the following:
(i) If $20$ people liked classical music, how many young people were surveyed?
(ii) Which type of music is liked by the maximum number of people?
(iii) If a cassette company were to make $1000$ CDs, how many of each type would they make?

Answer 1

(i)

Number of people who are into classical music $=10$%
$10$% of pie chart $=20$ people
$1$% $\Rightarrow \frac{20}{10}\times 100$
and $100$% $\Rightarrow \frac{20}{10}\times 100\times \frac{100}{100}$
$\Rightarrow 200$ people.

(ii)

Light chart represent maximum number as it is $40$% of total. $\therefore$ Light music is liked by max. people.

(iii)

Number of CD's of classical music $\Rightarrow \frac{10}{100}\times 1000(10$%)
$=100$
Number of CD's of semi classical music $=\frac{20}{100}\times 1000(20$%)
$=200$
Number of CD's of folk music $=\frac{30}{100}\times 1000=300$ ($30$%)
Number of CD's of light music $=\frac{40}{100}\times 1000$ ($40$%)
$=400$