Me ayudan determinar el valor de las siguientes figuras ​

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?

Suppose i flip two identical coins. what is the probability that i get one head and one tail?

Ineed in figuring out this problem.