19. What is the mean proportion of 7 & 28?
2 & 6JTA c) 14 d) 17.5
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The mean proportion of 7 and 28 is defined as
7:x::x:28, or
x^2 = 7*28, or
x = (7x7x2x2)^0.5 = 14.
So 14 is the mean proportion of 7 and 28.
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