Let s > 0. Suppose that the lifetimes of a certain brand of transistor are identically distributed and independent random variables with probability distribution function F . These transistors are randomly selected, one at a time, and their lifetimes are measured. Let N be the number of transistors tested when a transistor is found to have a lifetime of greater than s hours. Let XN be the lifetime of that long-lasting transistor. Are XN and N independent random variables?

Mariah is randomly choosing three books to read from the following: 5 mysteries, 7 biographies, and 8 science fiction novels. which of these statements are true? check all that apply. there are 20c3 possible ways to choose three books to read. there are 5c3 possible ways to choose three mysteries to read. there are 15c3 possible ways to choose three books that are not all mysteries. the probability that mariah will choose 3 mysteries can be expressed as . the probability that mariah will not choose all mysteries can be expressed as 1 −