Gary wanted to determine the average height of boys at the high school. his older brother is on the basketball team, so he asked him to measure his teammates. after interpreting the results, gary determined the average height of a high-school-aged boy to be 6 feet, 1 inch. would you consider these results to be valid?

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 −