Every normal model is defined by its parameters the mean

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Every Normal model is defined by its parameters: the mean and the standard deviation.

Suppose that the mean ?= 20, and that 45% of the area is above 30. What is the standard deviation?

A) 60

B) 70

C) 80

D) 90

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Every normal model is defined by its parameters the mean : every normal model is defined by its parameters the mean and the standard deviation.suppose that the mean ? 20 and that

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