Why is there so many college and high school questions and not emlamtry (i’m in 4th)

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 rule describes the composition of transformations that maps △abc to △a”b”c

Select the correct answer and solve for y