The numbers 20 through 30 are written on cards and placed in a box. Explain whether the events of
choosing a number that is a multiple of 3 or choosing
a number that is a multiple of 4 are mutually

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