Every twenty-fifth person who ordered a subscription to a weekly news magazine was contacted by market researchers to complete an opinion survey. the researchers were employing a technique known as:

Random Sampling.

Explanation:

It is a method of sampling a population by selecting a sample unit based on chance, and also based on non-zero probability.

Random sampling is easier to use as it helps to get generalized samples from a large group.

There are 4 types of random sampling.

•Simple random sampling.

•Systematic random sampling.

•Stratified random sampling

•Cluster random sampling.

mali had been a state inside of the ghanaian empire. after ghana fell because of invading forces and internal disputes, mali rose to greatness under the leadership of a legendary king named sundiata, the "lion king." the songhai empire, already weakened by internal political struggles, went into decline.