Stratified random sampling is a method of selecting a sample in which

See the explanation section.

Step-by-step explanation:

Stratified random sampling is a method of sampling that involves the division of a population into smaller groups known as strata.

It is also called stratification.

The strata are selected based on some certain shared attributes of the population like educational qualification, income or years of experience. Each strata are homogeneous in nature, that is, they are of the same characteristics.

d. bc = 12 and ef = 16

step-by-step explanation:

we are given that δabc : δdef such that .

also, it is given that

so, from the options, we need that .

a.

b.

c.  

d.

as, we can see that only option d gives the same ratio as i.e. .

hence, the possible lengths are bc = 12 and ef = 16.

answer: the first one

step-by-step explanation: use a calculator and divide the minutes by the dollars.