Koby visits one randomly selected science class from each grade and surveys the first ten students who leave the room. What question could he ask so that this group is a random sample? What question could he ask so that this group is a biased sample? Explain.​

The ratio of the measures of the three angles in a triangle is 2: 9: 4. find the measures of the angels

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

Factor the polynomial by its greatest common monomial factor.