Wednesday
July 23, 2014

Homework Help: Statistics

Posted by Shelby on Sunday, October 27, 2013 at 9:30pm.

A university has 1,000 computers available for students to use. Each computer
has a 250-gigabyte hard drive. The university wants to estimate the space
occupied on the hard drives. A random sample of 100 computers showed a mean
of 115 gigabytes used with a standard deviation of 20 gigabytes.
-I'm not clear on how to calculate these answers and would appreciate help a great deal. Thank you!
a) What is the standard error of the mean?
b) What is the probability that a sample mean is greater than 200 gigabytes?
c) What is the probability that a sample mean is greater than 120 gigabytes?
d) What is the probability that a sample mean is between 111 and 119
gigabytes?

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