Can someone me on this question 5 and 6

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 fraction is equal to 1hole and 2/5? a.3/5 b.75 c.57 d.73

Select the point that is a solution to the system of inequalities. y< =-x+3 y=x^(2)-3x