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

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

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter6: Systems Of Linear Equations And Inequalities
Section6.1: Graphing Systems Of Equations
Problem 59PFA
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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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