What's a smart way to save money on prescription drugs

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?

For each proportion find the unknown number x 1/5/8=×/15

The amount spent on food and drink by 20 customers is shown below what is the modal amount spent ?