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How do you find the area of a triangle

Acircle has a circumference of 28.36 units what is the diameter of the circle

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