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The measure of one angle of an octagon is two times smaller that of the other seven angles. what is the measure of each angle?

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

Which of the following is not a subset of {1,2,3}?