Gourmet Eatery has a policy of automatically adding an 18% tip to every restaurant bill. Write a equation to represent the relationship between the tip (t) and the restaurant bill (b)

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