Supposed that a travel bureau claims that the trees in a forest are 85 feet tall on average, with a standard deviation of 2 feet . If you took a sample of 64 trees, which of the following mean heights would be outside the 95% confidence interval?

What is the size of the matrix resulting from

The sat and act tests use very different grading scales. the sat math scores follow a normal distribution with mean 518 and standard deviation of 118. the act math scores follow a normal distribution with mean 20.7 and standard deviation of 5. suppose regan scores a 754 on the math portion of the sat. how much would her sister veronica need to score on the math portion of the act to meet or beat regan's score?

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?