What is 3/1 in an integer

Describe in detail how you would construct a 95% confidence interval for a set of 30 data points whose mean is 20 and population standard deviation is 3. be sure to show that you know the formula and how to plug into it. also, clearly state the margin of error.

Find the distance between (0,5) & (-4,2)

Which type of graph would allow us to quickly see how many students between 100 and 200 students were treated?