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What is the grand mean of 74 75 76 78 40 50 and 200 300 120 300 400 399?

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Mlcparra16viz
The grand mean is the mean of the means, the average of the averages.

So the grand mean is:
[tex] [\frac{74+75+76+78+40+50}{6} + \frac{200+300+120+300+400+399}{6} ]/2 \\ = (393+1719)/12 \\ = 2112/12 \\ =176[/tex]

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