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msladycie8831
27.04.2021 •
Mathematics
A variety pack of snacks contains 4 pretzel bags, 3 popcorn bags and 3 cheddar cracker bags. What is the probability that someone selects a pretzel bag, keeps it, and then selects another pretzel bag. HELLP PLS
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Ответ:
D. Observational study
Step-by-step explanation:
We are given that Nico looked around the cafeteria during the lunch to see whether people purchased lunch or brought their own.
It is known that:
1. 'Survey' means to question a wide variety of population about their views on a particular issue.
2. 'Simulation' refers to act out a situation or process in order to find some conclusions.
3. 'Experiment' represent a scientific procedure undertaken in demonstrate a fact or test a hypothesis.
4. 'Observational study' is to study the samples without the variables being under the control of the observer.