x-bar = 30, n = 25, = 4, confidence level = 90% We provide a sample

Question:

x-bar = 30, n = 25, σ = 4, confidence level = 90%
We provide a sample mean, sample size, population standard deviation, and confidence level. In each case, use the one-mean z-interval procedure to find a confidence interval for the mean of the population from which the sample was drawn.