Question
The process of making concrete in a mixer is under control if the rotations per minute of the mixer has a mean of 22 rpm.
The process of making concrete in a mixer is under control if the rotations per minute of the mixer has a mean of 22 rpm. What can we say about this process if a sample of 20 of these mixers has a mean rpm of22.75 rpm and a standard deviation of 3 rpm?
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An Engineering Approach To Linear Algebra
Authors: W W Sawyer
1st Edition
0511565941, 9780511565946
