Math
posted by Jameson .
A sample of 64 statistics students at a small college had a mean mathematics ACT score of 28 with a standard deviation of 4. Estimate the mean mathematics ACT score for all statistics students at this college. Give the 95% confidence interval.

Please only post your questions once. Repeating posts will not get a quicker response. In addition, it wastes our time looking over reposts that have already been answered in another post. Thank you.

D^2 Y/DX^2 +9Y = 1/Cos(3x)

FACTORIES A factory produces
6 motorcycles in 9 hours. Write a
proportion and solve it to find how
many hours it takes to produce
16 motorcycles. 
1 day 24 hours