Wat iz 2+2 i have been braining so hard ma think hurtz

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.

Ricardo ran the 400 meter race 3 times his fastest time was 54.3 seconds his slowest time was 56.1 seconds if his average time was 55.0 seconds what was his time for the third race

Which measure is equivalent to 110 ml? 0.0110 l 0.110 l 1.10 l 11,000 l