Ten observations taken of the time required to assemble a sofa frame in a furniture plant were
Question:
Ten observations taken of the time required to assemble a sofa frame in a furniture plant were as shown below (min). Find the
(a) mean time,
(b) standard deviation, and
(c) standard error of the mean.
Observation 4.7 4.2 5.1 4.8 5.5 5.4 5.8 4.8 5.0 4.7 50.0
(X – X) – 0.3 – 0.8 0.1 –0.2 0.5 0.4 0.8 – 0.2 0.0 –0.3
(X – X) 2 0.09 0.64 0.01 0.04 0.25 0.16 0.64 0.04 0.00 0.09 1.96
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