Calcula máx. c.d. (a, b) por el método óptimo?

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?

How long does it take natsumi to clean up after she is done? table: .area time30. 245. 2.7560. 3.5

Joanie wrote a letter that was 1 1/4 pages long. katie wrote a letter that was 3/4 page shorter then joagies letter. how long was katies letter