The owner of Britten's Egg Farm wants to estimate the mean number of eggs laid per chicken. A sample of 20 chickens shows they laid an average of 23 eggs per month with a standard deviation of 2.25 eggs per month.

(a-1)	What is the value of the population mean?

(a-2)	What is the best estimate of this value?

(c)	For a 99 percent confidence interval, the value of t is . (Round your answer to 3 decimal places.)

(d)	The 99 percent confidence interval for the population mean is _____ to _____ (Round your answers to 3 decimal places.)