Which statement is true of an appropriate sample of a population?
A sample must be a group of people who are the target of the survey question.
A sample should have different characteristics than the population.
A sample must be very small.
| A sample should include only boys or only girls.

distance covered by pamela in 9 l of fuel = 99km

let us apply unitary method here.

distance covered by pamela in 1 l of fuel =99/9 =11 km

now let us find distance covered by pamela if she has 12 l of fuel.

distance covered in 12 l = distance covered in 1 l of fuel * 12

we know that distance covered by here in 1 l is 11 km.

so distance covered in 12 l of fuel = 11*12 = 132 km.