There are 4 red balls, 6 white balls, and 3 blue balls in a bag. if one ball is drawn from the bag at random, what is the probability that it is not white?

Identify all the cases where non-probability sampling is used when attempting to study the characteristics of a large city. studies on every subject in the population divide a population in groups and obtain a sample studies with a limited amount of time demonstrate existing traits in a population studies with the nth person selected