Which statement is true about copper and salt? Both are mixtures.
Both are pure substances.
Copper is a mixture and salt is a pure substance.
Copper is a pure substance and salt is a mixture.

The weight of an object in a particular scale is 175.2 lbs. the measured weight may vary from the actual weight by at most 0.1 lbs. what is the range of actual weights of the object

What is the difference between the predicted value and the actual value

Aproduction manager test 10 toothbrushes and finds that their mean lifetime is 450 hours. she then design sales package of this type of toothbrush. it states that the customers can expect the toothbrush to last approximately 460 hours. this is an example of what phase of inferential statistics