15 is 9 more than j. as an equation.

How do you answer this question? (step by step)

Let the mean of the population be 38 instances of from 6" - 9" hatchings per nest, and let the standard deviation of the mean be 3. what sample mean would have a confidence level of 95% or a 2.5% margin of error?

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?