Examlex
Out of a sample of 639 gasoline purchases at a self-service gas station,544 were made with a credit or debit card.Obtain the predeterminated margin of error.Round your answer to three decimal places.
Oxygen
A chemical element (O) essential for most forms of life on Earth, vital for cellular respiration in organisms.
Friction
The resistance encountered when one object is moved in contact with another.
Pressure
The force exerted per unit area on the surface of an object, often measured in atmospheres, Pascals, or mmHg.
Callus
Thickened area of skin caused by repeated friction or pressure, or the healing tissue over a bone fracture.
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