what are the mean and the standard  deviation of the sample mean?

College Algebra
1st Edition
ISBN:9781938168383
Author:Jay Abramson
Publisher:Jay Abramson
Chapter9: Sequences, Probability And Counting Theory
Section9.5: Counting Principles
Problem 40SE: A family consisting of 2 parents and 3 children is to pose for a picture with 2 family members in...
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Q5

An office manager is looking to purchase a new printer for his office. He has 
narrowed his choices down to four printers but cannot decide which of the four he 
prefers. He has decided to choose two of the four printers at random, and then to let 
the other members of the office decide which of the two they prefer. The speeds, in 
pages per minute, of the four printers are 25, 30, 27, and 32. Considering the speeds 
of the two printers chosen to be the sample, what are the mean and the standard 
deviation of the sample mean?

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