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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