David has 5 yellow, 3 green, and 2 red gumballs in a bag. He takes out two at random and does replace them. A) What is the probability, , that the first gumball is green and the second is red? .

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