Dimitri rode his bike 32 miles yesterday. he rode 12 4/5 miles before lunch and the rest of the distance after lunch. how far did he ride after lunch?

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