Acontestant on a quiz show gets 150 points for every correct answer and loses 250 points for each incorrect answer. after answering 20 questions, the contestant has 200 points. how many questions has the contestant answered correctly and incorrectly?

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