Pls me to answer this.. a ratio of 21/11 is equal to a ratio of : 1

Long division the problem is 40 ➗ 348 = ?

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

East black horse $0.25 total budget is $555 it'll cost $115 for other supplies about how many flyers do you think we can buy