What's the conversion factor used to convert inches into yards

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

How long does it take natsumi to clean up after she is done? table: .area time30. 245. 2.7560. 3.5

8. kelly wants to buy a magazine that is $25. later the magazine was marked up an additional 20%. what is the new price?