Using the z-distribution, the 95% confidence interval of the population mean is: (17.5, 24.5).
<h3>What is a z-distribution confidence interval?</h3>The confidence interval is:
In which:
is the sample mean.
- z is the critical value.
- n is the sample size.
is the standard deviation for the population.
In this problem, we have a 95% confidence level, hence, z is the value of Z that has a p-value of
, so the critical value is z = 1.96.
For this problem, the other parameters are:
Hence the bounds of the interval are:
The interval is: (17.5, 24.5).
More can be learned about the z-distribution at brainly.com/question/25890103
#SPJ1