There are 30 students in the school chorale, and 12 of theses students can stay after school today to prepare the stage for the concert. what fraction of the students in chorale can stay after school today? write the fraction in simplest form.

If m 17 27 90 63 ** picture is attached

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

Plz ( true - false) all triangles have interior angles whose measure sum to 90.