rocksquad7917
28.08.2019 •
Chemistry
What must models and theories do in order to remain valid? provide 2 facts.
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Ответ:
1. Models and theories should explain known fact.
2. Models and theories should enable scientists to make accurate deductions and predictions.
Explanation:
A model involves the use of a physical, conceptual, or mathematical representation to describe a real phenomenon that could not be understood by mere direct observation. It could be in the form of a diagram or picture, aircraft model kit etc.
A theory is a well tested and confirmed phenomenon through repeated observations and experiments. It is a stronger assertion that explains the facts about a phenomenon. Such are not guesses or mere saying, but reliable accounts of some phenomenon in the real world.
Therefore for models and theories to be valid, they must explain known facts and enable scientists to make accurate predictions.
Ответ:
0.4625 or 46.25%
Step-by-step explanation:
The data for the percentage of contribution and the percentage of numbers from each suburb is presented in the table bellow:
The probability that she gets a donation is given by the sum of the probabilities of getting a donation from each suburb weighed by their respective percentage of numbers of the list:
The probability that she gets a donation is 0.4625 or 46.25%.