20 points to the first correct answer what is the base area of a rectangle with a width of 7.5in and a length of 10.5in and a height of 2in Include formula

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