Mean and standard deviation

A simple random sample of 12 Droids being sold over the Internet had the following prices, in dollars.  287, 311, 262, 392, 313, 341, 336, 316, 286, 299, 291. Assume that it is reasonable to believe that the population is approximately normal and the population standard deviation is 54.  What is the upper bound of the 95% confidence interval for the mean price for all phone types?

We help you get better grades, improve your productivity and get more fun out of college!!

How it works – it’s easy


Place your Order

Submit your requirements through our small easy order form. Be sure to include and attach any relevant materials.

Make a payment

The total price of your order is based on number of pages, academic level and deadline.


Writing process

We assign the assignment to the most qualified tutor. When the tutor completes the assignment, it is transferred to one of our professional editors to make sure that the assignment meets all of your requirements.

Once complete, we’ll send your assignment via the email provided on the order form.



Achieve academic success with the best online tutors.